251 pubblicazioni classificate nel seguente modo:

Features of Vat-Photopolymerized Masters for Microfluidic Device Manufacturing
BIOENGINEERING
Autore/i: Gatto, Maria Laura; Mengucci, Paolo; Mattioli-Belmonte, Monica; Munteanu, Daniel; Nasini, Roberto; Tognoli, Emanuele; Denti, Lucia; Gatto, Andrea
Classificazione: 1 Contributo su Rivista
Abstract: The growing interest in advancing microfluidic devices for manipulating fluids within micrometer-scale channels has prompted a shift in manufacturing practices, moving from single-component production to medium-size batches. This transition arises due to the impracticality of lab-scale manufacturing methods in accommodating the increased demand. This experimental study focuses on the design of master benchmarks 1-5, taking into consideration critical parameters such as rib width, height, and the relative width-to-height ratio. Notably, benchmarks 4 and 5 featured ribs that were strategically connected to the inlet, outlet, and reaction chamber of the master, enhancing their utility for subsequent replica production. Vat photopolymerization was employed for the fabrication of benchmarks 1-5, while replicas of benchmarks 4 and 5 were generated through polydimethylsiloxane casting. Dimensional investigations of the ribs and channels in both the master benchmarks and replicas were conducted using an optical technique validated through readability analysis based on the Michelson global contrast index. The primary goal was to evaluate the potential applicability of vat photopolymerization technology for efficiently producing microfluidic devices through a streamlined production process. Results indicate that the combination of vat photopolymerization followed by replication is well suited for achieving a minimum rib size of 25 mu m in width and an aspect ratio of 1:12 for the master benchmark.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/327151

Insights into PLGA-encapsulated epigallocatechin 3-gallate nanoparticles as a new potential biomedical system: A computational and experimental approach
EUROPEAN POLYMER JOURNAL
Autore/i: Minnelli, Cristina; Stipa, Pierluigi; Sabbatini, Simona; Mengucci, Paolo; Mobbili, Giovanna; Galeazzi, Roberta; Armeni, Tatiana; Romaldi, Brenda; Celli, Annamaria; Laudadio, Emiliano
Classificazione: 1 Contributo su Rivista
Abstract: Biodegradable poly-lactic poly-glycolic copolymer (PLGA) represents one of the best strategies adopted to convey small molecules unstable and characterised by a low bioavailability if administered without vehicles. This is the case of Epigallocatechin-3-gallate (EGCG), which is one of the most interesting polyphenols from a biomedical point of view. In this study, the impact of EGCG on PLGA nanoparticles (NPs) properties has been studied underlining the role of the binary PVA/Poloxamer-407 as stabilizer system for obtaining colloidal stable NPs. Characterization has been carried out by dynamic light scattering (DLS), encapsulation efficiency, drug release studies, scanning electron microscopy (SEM) and infrared spectroscopy (IR). Molecular dynamics (MD) simulations have been used to model the PLGA and EGCG systems to understand the behaviour of NPs and the interactions that guided the EGCG encapsulation. The nanodispersions exhibited promising cytotoxic potentials in human lung carcinoma A549 cell lines enhancing the well-known growth inhibitor effect of the free EGCG.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/309751

Beads for Cell Immobilization: Comparison of Alternative Additive Manufacturing Techniques
BIOENGINEERING
Autore/i: Gatto, Maria; Mengucci, Paolo; Munteanu, Daniel; Nasini, Roberto; Tognoli, Emanuele; Denti, Lucia; Gatto, Andrea
Classificazione: 1 Contributo su Rivista
Abstract: The attachment or entrapment of microbial cells and enzymes are promising solutions for various industrial applications. When the traps are beads, they are dispersed in a fluidized bed in a vessel where a pump guarantees fresh liquid inflow and waste outflow without washing out the cells. Scientific papers report numerous types of cell entrapment, but most of their applications remain at the laboratory level. In the present research, rigid polymer beads were manufactured by two different additive manufacturing (AM) techniques in order to verify the economy, reusability, and stability of the traps, with a view toward a straightforward industrial application. The proposed solutions allowed for overcoming some of the drawbacks of traditional manufacturing solutions, such as the limited mechanical stability of gel traps, and they guaranteed the possibility of producing parts of constant quality with purposely designed exchange surfaces, which are unfeasible when using conventional processes. AM proved to be a viable manufacturing solution for beads with complex shapes of two different size ranges. A deep insight into the production and characteristics of beads manufactured by AM is provided. The paper provides biotechnologists with a manufacturing perspective, and the results can be directly applied to transit from the laboratory to the industrial scale.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/327153

On the Biomechanical Performances of Duplex Stainless Steel Graded Scaffolds Produced by Laser Powder Bed Fusion for Tissue Engineering Applications
JOURNAL OF FUNCTIONAL BIOMATERIALS
Autore/i: Gatto, M. L.; Cerqueni., G.; Groppo, R.; Tognoli, E.; Santoni, A.; Cabibbo, M.; Mattioli-Belmonte, M.; Mengucci, P.
Classificazione: 1 Contributo su Rivista
Abstract: This experimental study aims to extend the know-how on biomechanical performances of duplex stainless steel (DSS) for tissue engineering applications to a graded lattice geometry scaffold based on the F53 DSS (UNS S32750 according to ASTM A182) produced by laser powder bed fusion (LPBF). The same dense-out graded geometry based on rhombic dodecahedral elementary unit cells investigated in previous work on 316L stainless steel (SS) was adopted here for the manufacturing of the F53 DSS scaffold (SF53). Microstructural characterization and mechanical and biological tests were carried out on the SF53 scaffold, using the in vitro behavior of the 316L stainless steel scaffold (S316L) as a control. Results show that microstructure developed as a consequence of different volume energy density (VED) values is mainly responsible for the different mechanical behaviors of SF53 and S316L, both fabricated using the same LPBF manufacturing system. Specifically, the ultimate compressive strength (σUC) and elastic moduli (E) of SF53 are three times and seven times higher than S316L, respectively. Moreover, preliminary biological tests evidenced better cell viability in SF53 than in S316L already after seven days of culture, suggesting SF53 with dense-out graded geometry as a viable alternative to 316L SS for bone tissue engineering applications.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/324493

Nanostructured iron oxide thin films deposited by RF sputtering as catalysts for the heterogeneous solar photo-Fenton reaction
VACUUM
Autore/i: Bosso, P.; Del Sole, R.; Milella, A.; Mengucci, P.; Barucca, G.; Armenise, V.; Bianco, G. V.; Fracassi, F.; Palumbo, F.
Classificazione: 1 Contributo su Rivista
Abstract: Nanostructured iron oxide coatings have been deposited by plasma sputtering by different approaches, with and without thermal annealing, with the aim of preparing supported catalysts for solar photo-Fenton. Depending on the experimental conditions explored (O2 content in the feed, annealing or bilayer approach) the phase composition of iron oxide changes and the surface nanostructure as well. The evaluation of methylene blue degradation in photo-Fenton reaction indicates a good performance of the investigated materials. Degradation percentage between 84 and 97% have been obtained in 180 min with a constant reaction rate as high as 18.0 × 10−3 min−1, with the best result for a bilayer sample obtained without thermal annealing. This preliminary investigation highlights that the photoactivity of the coatings is related not only to the content of α-Fe2O3, but also to the presence of developed nanostructures on the coating surface, making the material more active. The proposed method for producing supported catalyst based on photo-Fenton reaction is straightforward, and the possibility to reuse the catalyst up to ten reaction cycles is demonstrated.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/312232

Study on the mechanical properties of magnetron sputtered W-based degradable radiopaque coatings for tiny biodegradable metallic endovascular implants
EUROPEAN JOURNAL OF MECHANICS. A, SOLIDS
Autore/i: Ravanbakhsh, S.; Paternoster, C.; Chevallier, P.; Barucca, G.; Mengucci, P.; Parapari, S. S.; Shekargoftar, M.; Cabibbo, M.; Sturm, S.; Sarkissian, A.; Fortin, M. -A.; Mantovani, D.
Classificazione: 1 Contributo su Rivista
Abstract: Bioresorbable metals constitutes a new class of biomaterials, and raised increasing interest over the last decade to fabricate tiny endovascular metallic implants. However, the lack of visibility especially when tiny bioresorbable implants are implanted is a major concern in clinics, affecting their implantation and limiting their clinical follow-up. Among the radiopaque elements, tungsten (W) is a promising candidate to be used as a radiopaque resorbable agent due to its high radiopacity and high corrosion rate. Therefore, this research aimed to produce a W-based radiopaque coatings providing mechanical properties close to Fe–Mn–C alloys. The mechanical mismatch between the substrate and the coating was also investigated and optimized. A magnetron sputtering was used to deposit Fe–Mn–C–W coatings (A and B) with 38 and 79 at. % of W, respectively, and at different deposition temperatures, i.e. 25, 300 and 600 °C. TEM and XRD analyses evidenced that coatings A, ∼38 at.% of W, at all deposition temperature, exhibited an amorphous structure. The amorphous structure of coating A was composed of a matrix of Fe with tiny α-W nanocrystals embedded, while coating B (W: 73–79 at. %) displayed the presence of a pyramidal-like β-W phase, observed only at low deposition temperature (25 °C). The presence of this β-W phase significantly increased the coating roughness, and increased its corrosion rate. Mechanical properties, assessed by nanoindentation tests, confirmed that samples containing β-W exhibited higher elastic modulus and hardness when compared to other samples. X-ray studies by CT scanning demonstrated that 1 μm of coatings A and B deposited at high temperature could increase significantly the radiopacity of the samples by 109% and 62%, respectively. On the basis of all these results, the coating A deposited at 600 °C appears to be the most promising coating for X-ray enhancement as well as providing the mechanical properties matching those of Fe–Mn alloy.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/321676

Combined Effects of HA Concentration and Unit Cell Geometry on the Biomechanical Behavior of PCL/HA Scaffold for Tissue Engineering Applications Produced by LPBF
MATERIALS
Autore/i: Gatto, Maria Laura; Furlani, Michele; Giuliani, Alessandra; Cabibbo, Marcello; Bloise, Nora; Fassina, Lorenzo; Petruczuk, Marlena; Visai, Livia; Mengucci, Paolo
Classificazione: 1 Contributo su Rivista
Abstract: This experimental study aims at filling the gap in the literature concerning the combined effects of hydroxyapatite (HA) concentration and elementary unit cell geometry on the biomechanical performances of additively manufactured polycaprolactone/hydroxyapatite (PCL/HA) scaffolds for tissue engineering applications. Scaffolds produced by laser powder bed fusion (LPBF) with diamond (DO) and rhombic dodecahedron (RD) elementary unit cells and HA concentrations of 5, 30 and 50 wt.% were subjected to structural, mechanical and biological characterization to investigate the biomechanical and degradative behavior from the perspective of bone tissue regeneration. Haralick’s features describing surface pattern, correlation between micro- and macro-structural properties and human mesenchymal stem cell (hMSC) viability and proliferation have been considered. Experimental results showed that HA has negative influence on scaffold compaction under compression, while on the contrary it has a positive effect on hMSC adhesion. The unit cell geometry influences the mechanical response in the plastic regime and also has an effect on the cell proliferation. Finally, both HA concentration and elementary unit cell geometry affect the scaffold elastic deformation behavior as well as the amount of micro-porosity which, in turn, influences the scaffold degradation rate.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/319191

The impact of structure and temperature on the mechanical properties and radiopacity of Ta-W coatings for tiny endovascular medical implants
MATERIALS CHEMISTRY AND PHYSICS
Autore/i: Ravanbakhsh, Samira; Paternoster, Carlo; Mengucci, Paolo; Chevallier, Pascale; Gambaro, Sofia; Lescot, Theophraste; Paoletti, Chiara; Sales, Vinicius; Cabibbo, Marcello; Fortin, Marc-André; Mantovani, Diego
Classificazione: 1 Contributo su Rivista
Abstract: The trackability of tiny endovascular medical implants (TEMIs) during and after surgery is a crucial parameter for their accurate implantation and after surgery follow-ups. In this work, novel radiopaque Ta-W coatings were produced by magnetron sputtering deposition and further investigated with the aim to improve X-ray visibility of TEMIs under fluoroscopy imaging. Different deposition strategies, named micro-multilayer (Micro-ML), nano-multilayer (Nano-ML) and co-deposition (Co-dep), and different substrate temperatures (25 °C and 600 °C) were implemented which allowed to tune the morphology, mechanical properties and radiopacity of the coatings, while avoiding the formation of brittle phases, such as β-Ta and β-W. Ta-W coatings produced at high temperature (600 °C) contained stable phases such as α-Ta (bcc) and α-W (bcc), without brittle phases such as β-Ta and β-W. However, traces of β-W and β-Ta were detected in the group of samples produced at low substrate temperature (25 °C). The elastic modulus and the hardness of Micro-ML and Nano-ML were found to increase with increasing temperature, whereas they decreased in the case of samples produced by the Co-dep condition. The chemical state of Ta as well as the proportion of oxidized Ta (Ta-O) detected on all coatings were found to change as a function of the substrate temperature and deposition strategy. Samples with the highest amount of Ta-O at their surfaces showed the lowest corrosion potential. Finally, the samples produced by Micro-ML strategies performed on 600 °C substrates and irradiated according to radiographic imaging of conditions comparable to that of fluoroscopy, exhibited an X-ray contrast improvement of 82%/μm, which was higher than what was found in all other samples. Higher volume fractions of α-W in the coatings resulted in higher X-ray attenuation potential for photons in the energy range typical of fluoroscopy. Overall, the production of Ta-W coatings by the Micro-ML strategy and performed with a substrate temperature of 600 °C seems an optimal approach for the production of highly visible TEMIs in X-ray imaging.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/311667

Influence of Trabecular Geometry on Scaffold Mechanical Behavior and MG-63 Cell Viability
MATERIALS
Autore/i: Gatto, Maria Laura; Cerqueni, Giorgia; Furlani, Michele; Riberti, Nicole; Tognoli, Emanuele; Denti, Lucia; Leonardi, Francesco; Giuliani, Alessandra; Mattioli-Belmonte, Monica; Mengucci, Paolo
Classificazione: 1 Contributo su Rivista
Abstract: In a scaffold-based approach for bone tissue regeneration, the control over morphometry allows for balancing scaffold biomechanical performances. In this experimental work, trabecular geometry was obtained by a generative design process, and scaffolds were manufactured by vat photopolymerization with 60% (P60), 70% (P70) and 80% (P80) total porosity. The mechanical and biological performances of the produced scaffolds were investigated, and the results were correlated with morphometric parameters, aiming to investigate the influence of trabecular geometry on the elastic modulus, the ultimate compressive strength of scaffolds and MG-63 human osteosarcoma cell viability. The results showed that P60 trabecular geometry allows for matching the mechanical requirements of human mandibular trabecular bone. From the statistical analysis, a general trend can be inferred, suggesting strut thickness, the degree of anisotropy, connectivity density and specific surface as the main morphometric parameters influencing the biomechanical behavior of trabecular scaffolds, in the perspective of tissue engineering applications.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/312428

Improved biomechanical behavior of 316L graded scaffolds for bone tissue regeneration produced by laser powder bed fusion
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Autore/i: Gatto, Maria Laura; Cerqueni, Giorgia; Groppo, Riccardo; Santecchia, Eleonora; Tognoli, Emanuele; Defanti, Silvio; Mattioli-Belmonte, Monica; Mengucci, Paolo
Classificazione: 1 Contributo su Rivista
Abstract: Graded lattice scaffolds based on rhombic dodecahedral (RD) elementary unit cell geometry were manufactured in 316L stainless steel (SS) by laser powder bed fusion (LPBF). Two different strategies based on varying strut thickness layer-by-layer in the building direction were adopted to obtain the graded scaffolds: a) decreasing strut size from core to edge to produce the dense-in (DI) structure and b) increasing strut size in the same direction to produce the dense-out (DO) structure. Both graded structures (DI and DO) were constructed with specular symmetry with respect to the central horizontal axis. Structural, mechanical, and biological characterizations were carried out to evaluate feasibility of designing appropriate biomechanical performances of graded scaffolds in the perspective of bone tissue regeneration. Results showed that mechanical behavior is governed by graded geometry, while printing parameters influence structural properties of the material such as density, textures, and crystallographic phases. The predominant failure mechanism in graded structures initiates in correspondence of thinner struts, due to high stress concentrations on strut junctions. Biological tests evidenced better proliferation of cells in the DO graded scaffold, which in turn exhibits mechanical properties close to cortical bone. The combined control of grading strategy, printing parameters and elementary unit cell geometry can enable implementing scaffolds with improved biomechanical performances for bone tissue regeneration.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/327152

Assessment of the Remineralizing Potential of Biomimetic Materials on Early Artificial Caries Lesions after 28 Days: An In Vitro Study
BIOENGINEERING
Autore/i: Tosco, Vincenzo; Vitiello, Flavia; Monterubbianesi, Riccardo; Gatto, Maria Laura; Orilisi, Giulia; Mengucci, Paolo; Putignano, Angelo; Orsini, Giovanna
Classificazione: 1 Contributo su Rivista
Abstract: This study aimed to evaluate the loss of mineral content in the enamel surface in early artificial lesions and to assess the remineralizing potential of different agents by means of SEM coupled with energy-dispersive X-ray analysis (EDX). The analysis was performed on the enamel of 36 molars divided into six equal groups, in which the experimental ones (3-6) were treated using remineralizing agents for a 28-day pH cycling protocol as follows: Group 1, sound enamel; Group 2, artificially demineralized enamel; Group 3, CPP-ACP treatment; Group 4, Zn-hydroxyapatite treatment; Group 5, NaF 5% treatment; and Group 6, F-ACP treatment. Surface morphologies and alterations in Ca/P ratio were evaluated using SEM-EDX and data underwent statistical analysis (p < 0.05). Compared with the sound enamel of Group 1, the SEM images of Group 2 clearly showed loss of integrity, minerals, and interprismatic substances. Groups 3-6 showed a structural reorganization of enamel prisms, interestingly comprising almost the entire enamel surface. Group 2 revealed highly significant differences of Ca/P ratios compared with other groups, while Groups 3-6 showed no differences with Group 1. In conclusion, all tested materials demonstrated a biomimetic ability in remineralizing lesions after 28 days of treatment.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/316492

The Potential of Duplex Stainless Steel Processed by Laser Powder Bed Fusion for Biomedical Applications: A Review
METALS
Autore/i: Gatto, Maria Laura; Santoni, Alberto; Santecchia, Eleonora; Spigarelli, Stefano; Fiori, Fabrizio; Mengucci, Paolo; Cabibbo, Marcello
Classificazione: 1 Contributo su Rivista
Abstract: The austenitic stainless steels utilized in the production of osteosynthesis devices are susceptible to crevice corrosion. Several studies have compared the corrosive behavior of austenitic and duplex stainless steels (DSS), both of which are recognized as viable biomaterials for tissue engineering applications. All of the in vitro and in vivo studies on animals and clinical results reported to date indicate that austeno-ferritic duplex stainless steel can be recommended as a suitable alternative to ASTM F138 steel, since it is resistant to crevice corrosion in the human body and presents superior mechanical properties. The use of DSS for biomedical applications is still under discussion, mainly due to the lack of knowledge of its behavior in terms of device heating or induced movement when exposed to magnetic fields, a potentially harmful effect for the human body. As a breakthrough production technology, additive manufacturing (AM) has demonstrated significant benefits for the fabrication of metal devices with patient-specific geometry. Laser powder bed fusion has particularly been used to manufacture DSS-based components. A fine control of the processing conditions allows for an understanding of DSS microstructural evolution, which is essential for selecting processing parameters and estimating performance, including mechanical properties and corrosion resistance. Furthermore, scientific investigation is necessary for determining the relationships among material, process, and magnetic properties, in order to establish the underlying principles and critical responses. The purpose of this review is to highlight the key performances of DSS for biomedical applications and to point out the relevant role of advanced processing technologies such as additive manufacturing.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/315630

Luminescence and Structural Characterization of Gd2O2S Scintillators Doped with Tb3+, Ce3+, Pr3+ and F for Imaging Applications
CRYSTALS
Autore/i: De Martinis, Alessia; Montalto, Luigi; Scalise, Lorenzo; Rinaldi, Daniele; Mengucci, Paolo; Michail, Christos; Fountos, George; Martini, Nicki; Koukou, Vaia; Valais, Ioannis; Bakas, Athanasios; Fountzoula, Christine; Kandarakis, Ioannis; David, Stratos
Classificazione: 1 Contributo su Rivista
Abstract: Radiodiagnostic technologies are powerful tools for preventing diseases and monitoring the condition of patients. Medicine and sectors such as industry and research all use this inspection methodology. This field demands innovative and more sophisticated systems and materials for improving resolution and sensitivity, leading to a faster, reliable, and safe diagnosis. In this study, a large characterization of gadolinium oxysulfide (Gd2O2S) scintillator screens for imaging applications has been carried out. Seven scintillator samples were doped with praseodymium (Pr3+), terbium (Tb3+) activators and co-doped with praseodymium, cerium, and fluorine (Gd2O2S:Pr,Ce,F). The sample screens were prepared in the laboratory in the form of high packing density screens, following the methodology used in screen sample preparation in infrared spectroscopy and luminescence. Parameters such as quantum detection efficiency (QDE), energy absorption efficiency (EAE), and absolute luminescence efficiency (ALE) were evaluated. In parallel, a structural characterization was performed, via XRD and SEM analysis, for quality control purposes as well as for correlation with optical properties. Spatial resolution properties were experimentally evaluated via the Modulation Transfer Function. Results were compared with published data about Gd2O2S:Pr,Ce,F screens produced with a standard method of a sedimentation technique. In particular, the ALE rose with the X-ray tube voltage up to 100 kVp, while among the different dopants, Gd2O2S:Pr exhibited the highest ALE value. When comparing screens with different thicknesses, a linear trend for the ALE value was not observed; the highest ALE value was measured for the 0.57 mm thick Gd2O2S:Pr,Ce,F sample, while the best MTF values were found in the thinner Gd2O2S:Pr,Ce,F screen with 0.38 mm thickness.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/303799

Improving the radiopacity of Fe–Mn biodegradable metals by magnetron-sputtered W–Fe–Mn–C coatings: Application for thinner stents
BIOACTIVE MATERIALS
Autore/i: Ravanbakhsh, S.; Paternoster, C.; Barucca, G.; Mengucci, P.; Gambaro, S.; Lescot, T.; Chevallier, P.; Fortin, M. -A.; Mantovani, D.
Classificazione: 1 Contributo su Rivista
Abstract: In this exploratory work, micrometric radiopaque W–Fe–Mn–C coatings were produced by magnetron sputtering plasma deposition, for the first time, with the aim to make very thin Fe–Mn stents trackable by fluoroscopy. The power of Fe–13Mn-1.2C target was kept constant at 400 W while that of W target varied from 100 to 400 W producing three different coatings referred to as P100, P200, P400. The effect of the increased W power on coatings thickness, roughness, structure, corrosion behavior and radiopacity was investigated. The coatings showed a power-dependent thickness and W concentration, different roughness values while a similar and uniform columnar structure. An amorphous phase was detected for both P100 and P200 coatings while γ-Fe, bcc-W and W3C phases found for P400. Moreover, P200 and P400 showed a significantly higher corrosion rate (CR) compared to P100. The presence of W, W3C as well as the Fe amount variation determined two different micro-galvanic corrosion mechanisms significantly changing the CR of coatings, 0.26 ± 0.02, 59.68 ± 1.21 and 59.06 ± 1.16 μm/year for P100, P200 and P400, respectively. Sample P200 with its most uniform morphology, lowest roughness (RMS = 3.9 ± 0.4 nm) and good radiopacity (∼6%) appeared the most suitable radiopaque biodegradable coating investigated in this study.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/295106

Surface processing for iron-based degradable alloys: A preliminary study on the importance of acid pickling
BIOACTIVE MATERIALS
Autore/i: de Andrade, L. M.; Paternoster, C.; Chevallier, P.; Gambaro, S.; Mengucci, P.; Mantovani, D.
Classificazione: 1 Contributo su Rivista
Abstract: The formation of a heterogeneous oxidized layer, also called scale, on metallic surfaces is widely recognized as a rapid manufacturing event for metals and their alloys. Partial or total removal of the scale represents a mandatory integrated step for the industrial fabrication processes of medical devices. For biodegradable metals, acid pickling has already been reported as a preliminary surface preparation given further processes, such as electropolishing. Unfortunately, biodegradable medical prototypes presented discrepancies concerning acid pickling studies based on samples with less complex geometry (e.g., non-uniform scale removal and rougher surface). Indeed, this translational knowledge lacks a detailed investigation on this process, deep characterization of treated surfaces properties, as well as a comprehensive discussion of the involved mechanisms. In this study, the effects of different acidic media (HCl, HNO3, H3PO4, CH3COOH, H2SO4 and HF), maintained at different temperatures (21 and 60 °C) for various exposition time (15–240 s), on the chemical composition and surface properties of a Fe–13Mn-1.2C biodegradable alloy were investigated. Changes in mass loss, morphology and wettability evidenced the combined effect of temperature and time for all conditions. Pickling in HCl and HF solutions favor mass loss (0.03–0.1 g/cm2) and effectively remove the initial scale.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/298363

Electron Beam Powder Bed Fusion of Ti-48Al-2Cr-2Nb Open Porous Scaffold for Biomedical Applications: Process Parameters, Adhesion, and Proliferation of NIH-3T3 Cells
3D PRINTING AND ADDITIVE MANUFACTURING
Autore/i: Galati, M; Gatto, Ml; Bloise, N; Fassina, L; Saboori, A; Visai, L; Mengucci, P; Iuliano, L
Classificazione: 1 Contributo su Rivista
Abstract: Titanium aluminide (TiAl)-based intermetallics, especially Ti-48Al-2Cr-2Nb, are a well-established class of materials for producing bulky components using the electron beam powder bed fusion (EB-PBF) process. The biological properties of Ti-48Al-2Cr-2Nb alloy have been rarely investigated, specifically using complex cellular structures. This work investigates the viability and proliferation of NIH-3T3 fibroblasts on Ti-48Al-2Cr-2Nb dodecahedral open scaffolds manufactured by the EB-PBF process. A process parameter optimization is carried out to produce a fully dense part. Then scaffolds are produced and characterized using different techniques, including scanning electron microscopy and X-ray tomography. In vitro viability tests are performed with NIH-3T3 cells after incubation for 1, 4, and 7 days. The results show that Ti-48Al-2Cr-2Nb represents a promising new entry in the biomaterial field.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/307921

Development of Ti-Mo-Fe alloys combining different plastic deformation mechanisms for improved strength-ductility trade-off and high work hardening rate
JOURNAL OF ALLOYS AND COMPOUNDS
Autore/i: Catanio Bortolan, C.; Contri Campanelli, L.; Mengucci, P.; Barucca, G.; Giguere, N.; Brodusch, N.; Paternoster, C.; Bolfarini, C.; Gauvin, R.; Mantovani, D.
Classificazione: 1 Contributo su Rivista
Abstract: Titanium-based biomaterials are the gold standard for orthopedic implants; however, they are not generally suitable for the manufacture of intravascular stents. Their low strength-ductility trade-off and low work hardening rate are their main limitations. However, Ni-free alloys are desirable for such application in order to avoid allergic reactions caused by the high Ni-content materials currently applied. Therefore, in this study, three alloys of the Ti-Mo-Fe system (Ti-8Mo-2Fe, Ti-9Mo-1Fe and Ti-10.5Mo-1Fe) were designed to present high strength-ductility compromise and high work hardening rate. Their microstructures, mechanical properties and plastic deformation mechanism were investigated. Athermal ω precipitates were observed in the β matrix of all solution-treated alloys. In the solution-treated β matrix of the Ti-9Mo-1Fe alloy, additional nanometer-sized α" particles were detected by transmission electron microscopy (TEM). Although the combined TWIP/TRIP effects were expected by the design method on the Ti-8Mo-2Fe and Ti-9Mo-1Fe alloys, no TRIP effect was actually observed. In fact, stress-induced martensitic (SIM) transformation occurred mainly at the {332}<113> twins/matrix interfaces for all the strained microstructures and acted as a localized stress-relaxation mechanism, delaying the fracture. Based on the electron backscatter diffraction (EBSD) analyses, in the Ti-8Mo-2Fe and Ti-10.5Mo-1Fe alloys, the formation of a dense network of {332}<113> twins was responsible for their high and steady work hardening rates (1370 and 1120 MPa) and large uniform elongations (22% and 34%). The absence of SIM α" as the primary mechanism of plastic deformation and solid solution hardening of Fe resulted in their high strengths (yield strength of 772 and 523 MPa). In Ti-9Mo-1Fe, the formation of mechanical twinning was hindered, resulting in limited strain-hardening capability and low uniform elongation (6%). The nanometer-sized α" particles in its β matrix along with the athermal ω precipitates are thought to impair the mechanical twinning and the ductility of this alloy.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/306721

Remineralization Efficacy of Four Remineralizing Agents on Artificial Enamel Lesions: SEM-EDS Investigation
MATERIALS
Autore/i: Vitiello, Flavia; Tosco, Vincenzo; Monterubbianesi, Riccardo; Orilisi, Giulia; Gatto, Maria Laura; Sparabombe, Scilla; Meme', Lucia; Mengucci, Paolo; Putignano, Angelo; Orsini, Giovanna
Classificazione: 1 Contributo su Rivista
Abstract: Dental remineralization represents the process of depositing calcium and phosphate ions into crystal voids in demineralized enamel, producing net mineral gain and preventing early enamel lesions progression. The aim of the present study was to qualitatively and quantitatively compare the remineralizing effectiveness of four commercially available agents on enamel artificial lesions using Scanning Electron Microscopy (SEM) combined with Energy Dispersive Spectroscopy (EDS) techniques. Thirty-six extracted third molars were collected and randomly assigned to six groups (n = 6), five of which were suspended in demineralizing solution for 72 h to create enamel artificial lesions, and one serving as control: G1, treated with a mousse of casein phosphopeptide and amorphous calcium-phosphate (CPP-ACP); G2, treated with a gel containing nano-hydroxyapatite; G3, treated with a 5% SF varnish; G4, treated with a toothpaste containing ACP functionalized with fluoride and carbonate-coated with citrate; G5, not-treated artificial enamel lesions; G6, not demineralized and not treated sound enamel. G1-G4 were subjected to pH cycling over a period of seven days. Analyses of the specimens' enamel surfaces morphology were performed by SEM and EDS. Data were statistically analyzed for multiple group comparison by one-way ANOVA/Tukey's test (p < 0.05). The results show that the Ca/P ratio of the G5 (2.00 +/- 0.07) was statistically different (p < 0.05) from G1 (1.73 +/- 0.05), G2 (1.76 +/- 0.01), G3 (1.88 +/- 0.06) and G6 (1.74 +/- 0.04), while there were no differences (p > 0.05) between G1, G2 and G6 and between G4 (2.01 +/- 0.06) and G5. We concluded that G1 and G2 showed better surface remineralization than G3 and G4, after 7 days of treatment.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/308642

Influence of laser powder bed fusion process parameters on the properties of CuZn42 components: case study of the laser surface energy density
PROGRESS IN ADDITIVE MANUFACTURING
Autore/i: Gatto, A; Gatto, Ml; Groppo, R; Munteanu, D; Mengucci, P
Classificazione: 1 Contributo su Rivista
Abstract: Although additive manufacturing (AM) technologies have been rarely used to produce lead-containing brass, the same AM technologies have never been adopted to produce lead-free brass parts based on the CuZn42 alloy. This study aims to fill the gap, demonstrating the feasibility of lead-free brass alloys by laser powder bed fusion (LPBF) technology and investigating structural and mechanical properties of the produced specimens, focusing attention on the role of surface energy density on material properties. Starting from a raw powder of CuZn42 alloy containing alpha, beta and gamma brass phases, fully dense samples with high hardness values were obtained by LPBF. The structural and mechanical properties of the samples were investigated by scanning electron microscopy (SEM), energy-dispersive microanalysis (EDS), X-ray diffraction (XRD) and density and hardness measurements. Results showed that density, hardness and the relative amount of the brass phases depend on the surface energy density (SED) E-s. The investigated range of SED allowed defining the process window ranging from 2 J/mm(2) to 10 J/mm(2), within which fully dense samples can be obtained. A linear dependence of hardness on density was also found, suggesting that deformation mechanisms are mainly due to the presence of residual pores and internal cavities rather than to microstructural features, such as the relative amount of brass phases and crystallographic defects. All results obtained in this work demonstrated, for the first time, that LPBF is suitable to produce components based on the CuZn42 alloy, and that structural and mechanical properties of the produced parts can be properly designed by controlling SED.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/315511

Plasma-assisted deposition of iron oxide thin films for photoelectrochemical water splitting
PLASMA PROCESSES AND POLYMERS
Autore/i: Bosso, P.; Milella, A.; Barucca, G.; Mengucci, P.; Armenise, V.; Fanelli, F.; Giannuzzi, R.; Maiorano, V.; Fracassi, F.
Classificazione: 1 Contributo su Rivista
Abstract: Iron oxide thin films for photoelectrochemical (PEC) water splitting were deposited by radiofrequency sputtering of an iron target in argon/oxygen plasma mixtures, followed by thermal annealing. The chemical composition and structure of deposited film can be tuned by controlling the gas feed composition and the annealing temperature. The thermal treatment extensively improves the PEC water splitting performances of the films deposited at the lowest O2 percentages (0–1%), allowing to obtain photocurrent densities up to 1.20 mA/cm2 at 1.23 VRHE. Increasing the oxygen percentage in the plasma feed allows the direct growth of photoactive films; the best result is found for the hematite film produced at 50% O2, characterized by a photocurrent density of 0.21 at 1.23 VRHE.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/288861

Topological, Mechanical and Biological Properties of Ti6Al4V Scaffolds for Bone Tissue Regeneration Fabricated with Reused Powders via Electron Beam Melting
MATERIALS
Autore/i: Gatto, Maria Laura; Groppo, Riccardo; Bloise, Nora; Fassina, Lorenzo; Visai, Livia; Galati, Manuela; Iuliano, Luca; Mengucci, Paolo
Classificazione: 1 Contributo su Rivista
Abstract: Cellularized scaffold is emerging as the preferred solution for tissue regeneration and restoration of damaged functionalities. However, the high cost of preclinical studies creates a gap between investigation and the device market for the biomedical industry. In this work, bone-tailored scaffolds based on the Ti6Al4V alloy manufactured by electron beam melting (EBM) technology with reused powder were investigated, aiming to overcome issues connected to the high cost of preclinical studies. Two different elementary unit cell scaffold geometries, namely diamond (DO) and rhombic dodecahedron (RD), were adopted, while surface functionalization was performed by coating scaffolds with single layers of polycaprolactone (PCL) or with mixture of polycaprolactone and 20 wt.% hydroxyapatite (PCL/HA). The mechanical and biological performances of the produced scaffolds were investigated, and the results were compared to software simulation and experimental evidence available in literature. Good mechanical properties and a favorable environment for cell growth were obtained for all combinations of scaffold geometry and surface functionalization. In conclusion, powder recycling provides a viable practice for the biomedical industry to strongly reduce preclinical costs without altering biomechanical performance.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/315509

The potential of $Lambda$ and $Chi^{-}$ studies with PANDA at FAIR
THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI
Autore/i: Barucca, G.; Davi', F.; Lancioni, G.; Mengucci, P.; Montalto, L.; Natali, P. P.; Paone, N.; Rinaldi, D.; Scalise, L.; Erni, W.; Krusche, B.; Steinacher, M.; Walford, N.; Cao, N.; Liu, Z.; Liu, C.; Liu, B.; Shen, X.; Sun, S.; Tao, J.; Xiong, X. A.; Zhao, G.; Zhao, J.; Albrecht, M.; Alkakhi, W.; Bökelmann, S.; Feldbauer, F.; Fink, M.; Frech, J.; Freudenreich, V.; Fritsch, M.; Hagdorn, R.; Heinsius, F. H.; Held, T.; Holtmann, T.; Keshk, I.; Koch, H.; Kopf, B.; Kuhlmann, M.; Kümmel, M.; Küßner, M.; Li, J.; Mustafa, A.; Pelizäus, M.; Pitka, A.; Reher, J.; Reicherz, G.; Richter, M.; Schnier, C.; Sohl, L.; Steinke, M.; Triffterer, T.; Wenzel, C.; Wiedner, U.; Denizli, H.; Er, N.; Beck, R.; Hammann, C.; Hartmann, J.; Ketzer, B.; Müllers, J.; Rossbach, M.; Salisbury, B.; Schmidt, C.; Thoma, U.; Urban, M.; Bianconi, A.; Bragadireanu, M.; Pantea, D.; Domagala, M.; Filo, G.; Lisowski, E.; Lisowski, F.; Michałek, M.; Poznański, P.; Płażek, J.; Korcyl, K.; Kozela, A.; Lebiedowicz, P.; Pysz, K.; Schäfer, W.; Szczurek, A.; Fiutowski, T.; Idzik, M.; Swientek, K.; Terlecki, P.; Korcyl, G.; Lalik, R.; Malige, A.; Moskal, P.; Nowakowski, K.; Przygoda, W.; Rathod, N.; Rudy, Z.; Salabura, P.; Smyrski, J.; Augustin, I.; Böhm, R.; Lehmann, I.; Schmitt, L.; Varentsov, V.; Al-Turany, M.; Belias, A.; Deppe, H.; Dzhygadlo, R.; Flemming, H.; Gerhardt, A.; Götzen, K.; Heinz, A.; Jiang, P.; Karabowicz, R.; Koch, S.; Kurilla, U.; Lehmann, D.; Lühning, J.; Lynen, U.; Orth, H.; Peters, K.; Rieger, J.; Saito, T.; Schepers, G.; Schmidt, C. J.; Schwarz, C.; Schwiening, J.; Täschner, A.; Traxler, M.; Voss, B.; Wieczorek, P.; Abazov, V.; Alexeev, G.; Arefiev, V. A.; Astakhov, V.; Barabanov, M. Yu.; Batyunya, B. V.; Dodokhov, V. Kh.; Efremov, A.; Fechtchenko, A.; Galoyan, A.; Golovanov, G.; Koshurnikov, E. K.; Lobanov, Y. Yu.; Olshevskiy, A. G.; Piskun, A. A.; Samartsev, A.; Shimanski, S.; Skachkov, N. B.; Skachkova, A. N.; Strokovsky, E. A.; Tokmenin, V.; Uzhinsky, V.; Verkheev, A.; Vodopianov, A.; Zhuravlev, N. I.; Branford, D.; Watts, D.; Böhm, M.; Eyrich, W.; Lehmann, A.; Miehling, D.; Pfaffinger, M.; Quin, N.; Robison, L.; Seth, K.; Xiao, T.; Bettoni, D.; Ali, A.; Hamdi, A.; Himmelreich, M.; Krebs, M.; Nakhoul, S.; Nerling, F.; Belousov, A.; Kisel, I.; Kozlov, G.; Pugach, M.; Zyzak, M.; Bianchi, N.; Gianotti, P.; Lucherini, V.; Bracco, G.; Bettner, Y.; Bodenschatz, S.; Brinkmann, K. T.; Brück, L.; Diehl, S.; Dormenev, V.; Düren, M.; Erlen, T.; Föhl, K.; Hahn, C.; Hayrapetyan, A.; Hofmann, J.; Kegel, S.; Kesselkaul, M.; Köseoglu, I.; Kripko, A.; Kühn, W.; Lange, J. S.; Metag, V.; Moritz, M.; Nanova, M.; Novotny, R.; Orsich, P.; Pereira-de-Lira, J.; Peter, M.; Sachs, M.; Schmidt, M.; Schubert, R.; Stenzel, H.; Straube, M.; Strickert, M.; Thöring, U.; Wasem, T.; Wohlfahrt, B.; Zaunick, H. G.; Tomasi-Gustafsson, E.; Glazier, D.; Ireland, D.; Seitz, B.; Deepak, P. N.; Kulkarni, A.; Kappert, R.; Kavatsyuk, M.; Loehner, H.; Messchendorp, J.; Rodin, V.; Schakel, P.; Vejdani, S.; Dutta, K.; Kalita, K.; Huang, G.; Liu, D.; Peng, H.; Qi, H.; Sun, Y.; Zhou, X.; Kunze, M.; Azizi, K.; Derichs, A.; Dosdall, R.; Esmail, W.; Gillitzer, A.; Goldenbaum, F.; Grunwald, D.; Jokhovets, L.; Kannika, J.; Kulessa, P.; Orfanitski, S.; Pérez Andrade, G.; Prasuhn, D.; Prencipe, E.; Pütz, J.; Ritman, J.; Rosenthal, E.; Schadmand, S.; Schmitz, R.; Scholl, A.; Sefzick, T.; Serdyuk, V.; Stockmanns, T.; Veretennikov, D.; Wintz, P.; Wüstner, P.; Xu, H.; Zhou, Y.; Cao, X.; Hu, Q.; Li, Z.; Li, H.; Liang, Y.; Ma, X.; Rigato, V.; Isaksson, L.; Achenbach, P.; Aycock, A.; Corell, O.; Denig, A.; Distler, M.; Hoek, M.; Lauth, W.; Leithoff, H. H.; Liu, Z.; Merkel, H.; Müller, U.; Pochodzalla, J.; Schlimme, S.; Sfienti, C.; Thiel, M.; Zambrana, M.; Ahmed, S.; Bleser, S.; Bölting, M.; Capozza, L.; Dbeyssi, A.; Ehret, A.; Grasemann, P.; Klasen, R.; Kliemt, R.; Maas, F.; Maldaner, S.; Morales Morales, C.; Motzko, C.; Noll, O.; Pflüger, S.; Rodríguez Piñeiro, D.; Schupp, F.; Steinen, M.; Wolff, S.; Zimmermann, I.; Fedorov, A.; Kazlou, D.; Korzhik, M.; Missevitch, O.; Balashoff, A.; Boukharov, A.; Malyshev, O.; Balanutsa, P.; Chernetsky, V.; Demekhin, A.; Dolgolenko, A.; Fedorets, P.; Gerasimov, A.; Golubev, A.; Goryachev, V.; Kantsyrev, A.; Kirin, D. Y.; Kristi, N.; Ladygina, E.; Luschevskaya, E.; Matveev, V. A.; Panjushkin, V.; Stavinskiy, A. V.; Basant, K. N.; Kumawat, H.; Roy, B.; Saxena, A.; Yogesh, S.; Bonaventura, D.; Brand, P.; Fritzsch, C.; Grieser, S.; Hargens, C.; Hergemöller, A. K.; Hetz, B.; Hüsken, N.; Kellers, J.; Khoukaz, A.; Bumrungkoh, D.; Herold, C.; Khosonthongkee, K.; Kobdaj, C.; Limphirat, A.; Manasatitpong, K.; Nasawad, T.; Pongampai, S.; Simantathammakul, T.; Srisawad, P.; Wongprachanukul, N.; Yan, Y.; Yu, C.; Zhang, X.; Zhu, W.; Blinov, A. E.; Kononov, S.; Kravchenko, E. A.; Antokhin, E.; Barnyakov, A. Yu.; Beloborodov, K.; Blinov, V. E.; Kuyanov, I. A.; Pivovarov, S.; Pyata, E.; Tikhonov, Y.; Kunne, R.; Ramstein, B.; Hunter, G.; Lattery, M.; Pace, H.; Boca, G.; Duda, D.; Finger, M.; Finger Jr., M.; Kveton, A.; Pesek, M.; Peskova, M.; Prochazka, I.; Slunecka, M.; Volf, M.; Gallus, P.; Jary, V.; Korchak, O.; Marcisovsky, M.; Neue, G.; Novy, J.; Tomasek, L.; Tomasek, M.; Virius, M.; Vrba, V.; Abramov, V.; Bukreeva, S.; Chernichenko, S.; Derevschikov, A.; Ferapontov, V.; Goncharenko, Y.; Levin, A.; Maslova, E.; Melnik, Y.; Meschanin, A.; Minaev, N.; Mochalov, V.; Moiseev, V.; Morozov, D.; Nogach, L.; Poslavskiy, S.; Ryazantsev, A.; Ryzhikov, S.; Semenov, P.; Shein, I.; Uzunian, A.; Vasiliev, A.; Yakutin, A.; Roy, U.; Yabsley, B.; Belostotski, S.; Fedotov, G.; Gavrilov, G.; Izotov, A.; Manaenkov, S.; Miklukho, O.; Zhdanov, A.; Atac, A.; Bäck, T.; Cederwall, B.; Makonyi, K.; Preston, M.; Tegner, P. E.; Wölbing, D.; Gandhi, K.; Rai, A. K.; Godre, S.; Crede, V.; Dobbs, S.; Eugenio, P.; Lersch, D.; Calvo, D.; De Remigis, P.; Filippi, A.; Mazza, G.; Rivetti, A.; Wheadon, R.; Bussa, M. P.; Spataro, S.; Iazzi, F.; Lavagno, A.; Martin, A.; Akram, A.; Calen, H.; Ikegami Andersson, W.; Johansson, T.; Kupsc, A.; Marciniewski, P.; Papenbrock, M.; Regina, J.; Schönning, K.; Wolke, M.; Diaz, J.; Pothodi Chackara, V.; Chlopik, A.; Kesik, G.; Melnychuk, D.; Tarasiuk, J.; Wojciechowski, M.; Wronka, S.; Zwieglinski, B.; Amsler, C.; Bühler, P.; Kratochwil, N.; Marton, J.; Nalti, W.; Steinschaden, D.; Widmann, E.; Zimmermann, S.; Zmeskal, J.
Classificazione: 1 Contributo su Rivista
Abstract: The antiproton experiment PANDA at FAIR is designed to bring hadron physics to a new level in terms of scope, precision and accuracy. In this work, its unique capability for studies of hyperons is outlined. We discuss ground-state hyperons as diagnostic tools to study non-perturbative aspects of the strong interaction, and fundamental symmetries. New simulation studies have been carried out for two benchmark hyperon-antihyperon production channels: ¯→¯ and ¯→¯+−. The results, presented in detail in this paper, show that hyperon-antihyperon pairs from these reactions can be exclusively reconstructed with high efficiency and very low background contamination. In addition, the polarisation and spin correlations have been studied, exploiting the weak, self-analysing decay of hyperons and antihyperons. Two independent approaches to the finite efficiency have been applied and evaluated: one standard multidimensional efficiency correction approach, and one efficiency independent approach. The applicability of the latter was thoroughly evaluated for all channels, beam momenta and observables. The standard method yields good results in all cases, and shows that spin observables can be studied with high precision and accuracy already in the first phase of data taking with PANDA.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/289960

Feasibility studies for the measurement of time-like proton electromagnetic form factors from ¯p p → μ + μ − at PANDA at FAIR
THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI
Autore/i: Barucca, Gianni; Davi', F.; Lancioni, G.; Mengucci, P.; Montalto, L.; Natali, P. P.; Paone, N.; Rinaldi, D.; Scalise, L.; Erni, W.; Krusche, B.; Steinacher, M.; Walford, N.; Cao, N.; Liu, Z.; Liu, C.; Liu, B.; Shen, X.; Sun, S.; Tao, J.; Xiong, X. A.; Zhao, G.; Zhao, J.; Albrecht, M.; Alkakhi, W.; Bökelmann, S.; Coen, S.; Feldbauer, F.; Fink, M.; Frech, J.; Freudenreich, V.;   , ; M. Fritsch,   ; J. Grochowski,   ; R. Hagdorn,   ; F. H. Heinsius,   ; T. Held,   ; T. Holtmann,   ; I. Keshk,   ; H. Koch,   ; B. Kopf,   ; M. Kuhlmann,   ; M. Kümmel,   ; M. Küßner,   ; J. Li,   ; L. Linzen,   ; S. Maldaner,   ; J. Oppotsch,   ; S. Pankonin,   ; M. Pelizäus,   ; S. Pflüger,   ; A. Pitka,   ; J. Reher,   ; G. Reicherz,   ; C. Schnier,   ; M. Steinke,   ; T. Triffterer,   ; C. Wenzel,   ; Wiedner, U.; Denizli, H.;   , ; N. Er,   ; U. Keskin,   ; A. T. Olgun,   ; Yerlikaya, S.; Yilmaz, A.; Beck, R.;   , ; C. Hammann,   ; J. Hartmann,   ; B. Ketzer,   ; J. Müllers,   ; M. Rossbach,   ; B. Salisbury,   ; C. Schmidt,   ; U. Thoma,   ; Urban, M.; Bianconi, A.; Bragadireanu, M.; Pantea, D.; Domagala, M.;   , ; G. Filo,   ; E. Lisowski,   ; F. Lisowski,   ; M. Michałek,   ; Poznański, P.; Płażek, J.; Korcyl, K.;   , ; A. Kozela,   ; P. Lebiedowicz,   ; K. Pysz,   ; W. Schäfer,   ; Szczurek, A.; Firlej, M.;   , ; T. Fiutowski,   ; M. Idzik,   ; J. Moron,   ; Swientek, K.; Terlecki, P.; Korcyl, G.;   , ; R. Lalik,   ; A. Malige,   ; P. Moskal,   ; K. Nowakowski,   ; W. Przygoda,   ; N. Rathod,   ; Z. Rudy,   ; Salabura, P.; Smyrski, J.; Augustin, I.;   , ; R. Böhm,   ; I. Lehmann,   ; Schmitt, L.; Varentsov, V.; Al-Turany, M.;   , ; A. Belias,   ; H. Deppe,   ; R. Dzhygadlo,   ; H. Flemming,   ; A. Gerhardt,   ; K. Götzen,   ; A. Heinz,   ; P. Jiang,   ; R. Karabowicz,   ; S. Koch,   ; U. Kurilla,   ; D. Lehmann,   ; J. Lühning,   ; U. Lynen,   ; H. Orth,   ; K. Peters,   ; T. Saito,   ; G. Schepers,   ; C. J. Schmidt,   ; C. Schwarz,   ; J. Schwiening,   ; A. Täschner,   ; M. Traxler,   ; Voss, B.; Wieczorek, P.; Abazov, V.;   , ; G. Alexeev,   ; V. A. Arefiev,   ; V. Astakhov,   ; M. Yu. Barabanov,   ; B. V. Batyunya,   ; V. Kh. Dodokhov,   ; A. Efremov,   ; A. Fechtchenko,   ; A. Galoyan,   ; G. Golovanov,   ; E. K. Koshurnikov,   ; Y. Yu. Lobanov,   ; A. G. Olshevskiy,   ; A. A. Piskun,   ; A. Samartsev,   ; S. Shimanski,   ; N. B. Skachkov,   ; A. N. Skachkova,   ; E. A. Strokovsky,   ; V. Tokmenin,   ; V. Uzhinsky,   ; A. Verkheev,   ; Vodopianov, A.; Zhuravlev, N. I.; Branford, D.; Watts, D.; Böhm, M.;   , ; W. Eyrich,   ; A. Lehmann,   ; Miehling, D.; Pfaffinger, M.; Quin, N.;   , ; L. Robison,   ; Seth, K.; Xiao, T.; Bettoni, D.; Ali, A.;   , ; A. Hamdi,   ; M. Himmelreich,   ; M. Krebs,   ; Nakhoul, S.; Nerling, F.; Belousov, A.;   , ; I. Kisel,   ; G. Kozlov,   ; Pugach, M.; Zyzak, M.; Bianchi, N.;   , ; Gianotti, P.; Lucherini, V.; Bracco, G.; Bettner, Y.;   , ; S. Bodenschatz,   ; K. T. Brinkmann,   ; L. Brück,   ; S. Diehl,   ; V. Dormenev,   ; M. Düren,   ; T. Erlen,   ; K. Föhl,   ; C. Hahn,   ; A. Hayrapetyan,   ; J. Hofmann,   ; S. Kegel,   ; M. Kesselkaul,   ; I. Köseoglu,   ; A. Kripko,   ; W. Kühn,   ; J. S. Lange,   ; V. Metag,   ; M. Moritz,   ; M. Nanova,   ; R. Novotny,   ; P. Orsich,   ; J. Pereira-de-Lira,   ; M. Peter,   ; M. Sachs,   ; M. Schmidt,   ; R. Schubert,   ; H. Stenzel,   ; M. Straube,   ; M. Strickert,   ; U. Thöring,   ; T. Wasem,   ; Wohlfahrt, B.; Zaunick, H. G.; Tomasi-Gustafsson, E.; Glazier, D.;   , ; Ireland, D.; Seitz, B.; Deepak, P. N.; Kulkarni, A.; Kappert, R.;   , ; M. Kavatsyuk,   ; H. Loehner,   ; J. Messchendorp,   ; V. Rodin,   ; Schakel, P.; Vejdani, S.; Dutta, K.; Kalita, K.; Huang, G.;   , ; D. Liu,   ; H. Peng,   ; H. Qi,   ; Sun, Y.; Zhou, X.; Kunze, M.; Azizi, K.; Tavukoglu, Z.; Derichs, A.;   , ; R. Dosdall,   ; W. Esmail,   ; A. Gillitzer,   ; F. Goldenbaum,   ; D. Grunwald,   ; L. Jokhovets,   ; J. Kannika,   ; P. Kulessa,   ; S. Orfanitski,   ; G. Pérez Andrade,   ; D. Prasuhn,   ; E. Prencipe,   ; J. Pütz,   ; J. Ritman,   ; E. Rosenthal,   ; S. Schadmand,   ; R. Schmitz,   ; A. Scholl,   ; T. Sefzick,   ; V. Serdyuk,   ; T. Stockmanns,   ; D. Veretennikov,   ; P. Wintz,   ; P. Wüstner,   ; Xu, H.; Zhou, Y.; Cao, X.;   , ; Q. Hu,   ; Z. Li,   ; H. Li,   ; Liang, Y.; Ma, X.; Rigato, V.; Isaksson, L.; Achenbach, P.;   , ; O. Corell,   ; A. Denig,   ; M. Distler,   ; M. Hoek,   ; W. Lauth,   ; H. H. Leithoff,   ; Z. Liu,   ; H. Merkel,   ; U. Müller,   ; J. Pochodzalla,   ; S. Schlimme,   ; C. Sfienti,   ; Thiel, M.; Zambrana, M.; Ahmed, S.;   , ; S. Bleser,   ; M. Bölting,   ; L. Capozza,   ; A. Dbeyssi,   ; A. Ehret,   ; R. Klasen,   ; R. Kliemt,   ; F. Maas,   ; C. Motzko,   ; O. Noll,   ; D. Rodríguez Piñeiro,   ; F. Schupp,   ; M. Steinen,   ; Wolff, S.; Zimmermann, I.; Fedorov, A.;   , ; D. Kazlou,   ; Korzhik, M.; Missevitch, O.; Balanutsa, P.;   , ; V. Chernetsky,   ; A. Demekhin,   ; A. Dolgolenko,   ; P. Fedorets,   ; A. Gerasimov,   ; A. Golubev,   ; V. Goryachev,   ; A. Kantsyrev,   ; D. Y. Kirin,   ; N. Kristi,   ; E. Ladygina,   ; E. Luschevskaya,   ; V. A. Matveev,   ; Panjushkin, V.; Stavinskiy, A. V.; Balashoff, A.;   , ; Boukharov, A.; Malyshev, O.; Basant, K. N.;   , ; H. Kumawat,   ; B. Roy,   ; Saxena, A.; Yogesh, S.; Bonaventura, D.;   , ; P. Brand,   ; C. Fritzsch,   ; S. Grieser,   ; C. Hargens,   ; A. K. Hergemöller,   ; B. Hetz,   ; N. Hüsken,   ; J. Kellers,   ; A. Khoukaz,   ; Mannweiler, C.; Vestrick, S.; Bumrungkoh, D.;   , ; C. Herold,   ; K. Khosonthongkee,   ; C. Kobdaj,   ; A. Limphirat,   ; K. Manasatitpong,   ; T. Nasawad,   ; S. Pongampai,   ; T. Simantathammakul,   ; P. Srisawad,   ; Wongprachanukul, N.; Yan, Y.; Yu, C.;   , ; Zhang, X.; Zhu, W.; Blinov, A. E.;   , ; Kononov, S.; Kravchenko, E. A.; Antokhin, E.;   , ; A. Yu. Barnyakov,   ; K. Beloborodov,   ; V. E. Blinov,   ; I. A. Kuyanov,   ; S. Pivovarov,   ; Pyata, E.; Tikhonov, Y.; Hunter, G.;   , ; Lattery, M.; Pace, H.; Boca, G.; Duda, D.; Finger, M.;   , ; Finger, M.;   , Jr.; A. Kveton,   ; M. Pesek,   ; M. Peskova,   ; I. Prochazka,   ; Slunecka, M.; Volf, M.; Gallus, P.;   , ; V. Jary,   ; O. Korchak,   ; M. Marcisovsky,   ; G. Neue,   ; J. Novy,   ; L. Tomasek,   ; M. Tomasek,   ; Virius, M.; Vrba, V.; Abramov, V.;   , ; S. Bukreeva,   ; S. Chernichenko,   ; A. Derevschikov,   ; V. Ferapontov,   ; Y. Goncharenko,   ; A. Levin,   ; E. Maslova,   ; Y. Melnik,   ; A. Meschanin,   ; N. Minaev,   ; V. Mochalov,   ; V. Moiseev,   ; D. Morozov,   ; L. Nogach,   ; S. Poslavskiy,   ; A. Ryazantsev,   ; S. Ryzhikov,   ; P. Semenov,   ; I. Shein,   ; A. Uzunian,   ; Vasiliev, A.; Yakutin, A.; Roy, U.; Yabsley, B.; Belostotski, S.;   , ; G. Fedotov,   ; G. Gavrilov,   ; A. Izotov,   ; S. Manaenkov,   ; Miklukho, O.; Zhdanov, A.; Atac, A.;   , ; Bäck, T.; Cederwall, B.; Makonyi, K.;   , ; M. Preston,   ; Tegner, P. E.; Wölbing, D.; Gandhi, K.; Rai, A. K.; Godre, S.; Crede, V.;   , ; S. Dobbs,   ; Eugenio, P.; Lersch, D.; Calvo, D.;   , ; P. De Remigis,   ; A. Filippi,   ; G. Mazza,   ; Rivetti, A.; Wheadon, R.; Bussa, M. P.; Spataro, S.; Iazzi, F.; Lavagno, A.; Martin, A.; Akram, A.;   , ; H. Calen,   ; W. Ikegami Andersson,   ; T. Johansson,   ; A. Kupsc,   ; P. Marciniewski,   ; M. Papenbrock,   ; J. Regina,   ; J. Rieger,   ; Schönning, K.; Wolke, M.; Pothodi Chackara, V.; Chlopik, A.;   , ; G. Kesik,   ; D. Melnychuk,   ; J. Tarasiuk,   ; M. Wojciechowski,   ; Wronka, S.; Zwieglinski, B.; Amsler, C.;   , ; P. Bühler,   ; J. Marton,   ; W. Nalti,   ; D. Steinschaden,   ; E. Widmann,   ; S. Zimmermann, J. Zmeskal
Classificazione: 1 Contributo su Rivista
Abstract: This paper reports on Monte Carlo simulation results for future measurements of the moduli of time-like proton electromagnetic form factors, || | G E | and || | G M | , using the ¯→+− p ¯ p → μ + μ − reaction at P⎯⎯⎯ANDA P ¯ ANDA (FAIR). The electromagnetic form factors are fundamental quantities parameterizing the electric and magnetic structure of hadrons. This work estimates the statistical and total accuracy with which the form factors can be measured at P⎯⎯⎯ANDA P ¯ ANDA , using an analysis of simulated data within the PandaRoot software framework. The most crucial background channel is ¯→+− p ¯ p → π + π − , due to the very similar behavior of muons and pions in the detector. The suppression factors are evaluated for this and all other relevant background channels at different values of antiproton beam momentum. The signal/background separation is based on a multivariate analysis, using the Boosted Decision Trees method. An expected background subtraction is included in this study, based on realistic angular distributions of the background contribution. Systematic uncertainties are considered and the relative total uncertainties of the form factor measurements are presented.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/286840

Effect of oxygen content on the mechanical properties and plastic deformation mechanisms in the TWIP/TRIP Ti–12Mo alloy
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Autore/i: Catanio Bortolan, C.; Contri Campanelli, L.; Paternoster, C.; Giguere, N.; Brodusch, N.; Bolfarini, C.; Gauvin, R.; Mengucci, P.; Barucca, G.; Mantovani, D.
Classificazione: 1 Contributo su Rivista
Abstract: In the last decades, biomaterials have improved the life and its quality for millions around the Globe. Titanium-based biomaterials have rapidly become the gold standard for bone contact applications. Despite their successful performance, their low strength-ductility trade-offs and work-hardening rates limit their use for example for the manufacture of vascular stents. Although a high strength-ductility trade-off and a high work-hardening rate were reported for the TWIP/TRIP Ti–12Mo alloy, strengthening strategies are required to approach its strength to the ones of Co–Cr alloys, main metallic materials used to produce stents. In this study, the investigated strengthening strategy was the increase of oxygen content from 0.04 to 0.18 wt% in the Ti–12Mo alloy. The effect of this increase on its microstructure, mechanical properties and plastic deformation mechanisms was studied. Athermal ω precipitates were observed throughout with the β matrix of both solution-treated alloys. X-Ray diffraction and transmission electron microscopy suggested that the quantity of ω phase was larger in the alloy with a higher oxygen content, contrasting with the common knowledge that O suppresses ω phase precipitation. Independently of oxygen content, {332}<113> twins and stress-induced martensite (SIM) α" occurred in the deformed microstructures. Based on the electron backscatter diffraction analyses, the area fraction of SIM α" decreased by increasing oxygen content. Although elongation decreased with this oxygen content increase, Ti–12Mo-0.18O exhibited a high true uniform elongation of 25% and a true ultimate tensile strength higher than the Ti–12Mo-0.04O alloy. Hardness and yield strength also increased by increasing oxygen content, while elastic modulus did not change.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/290576

PANDA Phase one
EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI
Autore/i: Barucca, G.; Davi', F.; Lancioni, G.; Mengucci, P.; Montalto, L.; Natali, P. P.; Paone, N.; Rinaldi, D.; Scalise, L.; Krusche, B.; Steinacher, M.; Liu, Z.; Liu, C.; Liu, B.; Shen, X.; Sun, S.; Zhao, G.; Zhao, J.; Albrecht, M.; Alkakhi, W.; Bökelmann, S.; Coen, S.; Feldbauer, F.; Fink, M.; Frech, J.; Freudenreich, V.; Fritsch, M.; Grochowski, J.; Hagdorn, R.; Heinsius, F. H.; Held, T.; Holtmann, T.; Keshk, I.; Koch, H.; Kopf, B.; Kümmel, M.; Ner, M. Kü.; Li, J.; Linzen, L.; Maldaner, S.; Oppotsch, J.; Pankonin, S.; Pelizäus, M.; Pflüger, S.; Reher, J.; Reicherz, G.; Schnier, C.; Steinke, M.; Triffterer, T.; Wenzel, C.; Wiedner, U.; Denizli, H.; Er, N.; Keskin, U.; Yerlikaya, S.; Yilmaz, A.; Beck, R.; Chauhan, V.; Hammann, C.; Hartmann, J.; Ketzer, B.; Müllers, J.; Salisbury, B.; Schmidt, C.; Thoma, U.; Urban, M.; Bianconi, A.; Bragadireanu, M.; Pantea, D.; Rimjaem, S.; Domagala, M.; Filo, G.; Lisowski, E.; Lisowski, F.; Michałek, M.; Pozna´ nski, P.; Płazek, J.; Korcyl, K.; Lebiedowicz, P.; Pysz, K.; Schäfer, W.; Szczurek, A.; Firlej, M.; Fiutowski, T.; Idzik, M.; Moron, J.; Swientek, K.; Terlecki, P.; Korcyl, G.; Lalik, R.; Malige, A.; Moskal, P.; Nowakowski, K.; Przygoda, W.; Rathod, N.; Salabura, P.; Smyrski, J.; Augustin, I.; Böhm, R.; Lehmann, I.; Schmitt, L.; Varentsov, V.; Al-Turany, M.; Belias, A.; Deppe, H.; Dzhygadlo, R.; Flemming, H.; Gerhardt, A.; Götzen, K.; Heinz, A.; Jiang, P.; Karabowicz, R.; Koch, S.; Kurilla, U.; Lehmann, D.; Lühning, J.; Lynen, U.; Orth, H.; Peters, K.; Pütz, J.; Ritman, J.; Schepers, G.; Schmidt, C. J.; Schwarz, C.; Schwiening, J.; Täschner, A.; Traxler, M.; Voss, B.; Wieczorek, P.; Abazov, V.; Alexeev, G.; Barabanov, M. Yu.; Dodokhov, V. Kh.; Efremov, A.; Fechtchenko, A.; Galoyan, A.; Golovanov, G.; Koshurnikov, E. K.; Lobanov, Y. Yu.; Olshevskiy, A. G.; Piskun, A. A.; Samartsev, A.; Shimanski, S.; Skachkov, N. B.; Skachkova, A. N.; Strokovsky, E. A.; Tokmenin, V.; Uzhinsky, V.; Verkheev, A.; Vodopianov, A.; Zhuravlev, N. I.; Watts, D.; Böhm, M.; Eyrich, W.; Lehmann, A.; Miehling, D.; Pfaffinger, M.; Seth, K.; Xiao, T.; Ali, A.; Hamdi, A.; Himmelreich, M.; Krebs, M.; Nakhoul, S.; Nerling, F.; Gianotti, P.; Lucherini, V.; Bracco, G.; Bodenschatz, S.; Brinkmann, K. T.; Brück, L.; Diehl, S.; Dormenev, V.; Düren, M.; Erlen, T.; Hahn, C.; Hayrapetyan, A.; Hofmann, J.; Kegel, S.; Khalid, F.; Köseoglu, I.; Kripko, A.; Kühn, W.; Metag, V.; Moritz, M.; Nanova, M.; Novotny, R.; Orsich, P.; Pereira-de-Lira, J.; Sachs, M.; Schmidt, M.; Schubert, R.; Strickert, M.; Wasem, T.; Zaunick, H. G.; Tomasi-Gustafsson, E.; Glazier, D.; Ireland, D.; Seitz, B.; Kappert, R.; Kavatsyuk, M.; Loehner, H.; Messchendorp, J.; A, ; Rodin, V.; Kalita, K.; Huang, G.; Liu, D.; Peng, H.; Qi, H.; Sun, Y.; Zhou, X.; Kunze, M.; Azizi, K.; Olgun, A. T.; Tavukoglu, Z.; Derichs, A.; Dosdall, R.; Esmail, W.; Gillitzer, A.; Goldenbaum, F.; Grunwald, D.; Jokhovets, L.; Kannika, J.; Kulessa, P.; Orfanitski, S.; Perez-Andrade, G.; Prasuhn, D.; Prencipe, E.; Rosenthal, E.; Schadmand, S.; Schmitz, R.; Scholl, A.; Sefzick, T.; Serdyuk, V.; Stockmanns, T.; Veretennikov, D.; Wintz, P.; Wüstner, P.; Xu, H.; Zhou, Y.; Cao, X.; Hu, Q.; Liang, Y.; Rigato, V.; Isaksson, L.; Achenbach, P.; Corell, O.; Denig, A.; Distler, M.; Hoek, M.; Lauth, W.; Leithoff, H. H.; Merkel, H.; Müller, U.; Petersen, J.; Pochodzalla, J.; Schlimme, S.; Sfienti, C.; Thiel, M.; Bleser, S.; Bölting, M.; Capozza, L.; Dbeyssi, A.; Ehret, A.; Klasen, R.; Kliemt, R.; Maas, F.; Motzko, C.; Noll, O.; Rodríguez Piñeiro, D.; Schupp, F.; Steinen, M.; Wolff, S.; Zimmermann, I.; Kazlou, D.; Korzhik, M.; Missevitch, O.; Balanutsa, P.; Chernetsky, V.; Demekhin, A.; Dolgolenko, A.; Fedorets, P.; Gerasimov, A.; Golubev, A.; Kantsyrev, A.; Kirin, D. Y.; Kristi, N.; Ladygina, E.; Luschevskaya, E.; Matveev, V. A.; Panjushkin, V.; Stavinskiy, A. V.; Balashoff, A.; Boukharov, A.; Bukharova, M.; Malyshev, O.; Vishnevsky, E.; Bonaventura, D.; Brand, P.; Hetz, B.; Hüsken, N.; Kellers, J.; Khoukaz, A.; Klostermann, D.; Mannweiler, C.; Vestrick, S.; Bumrungkoh, D.; Herold, C.; Khosonthongkee, K.; Kobdaj, C.; Limphirat, A.; Manasatitpong, K.; Nasawad, T.; Pongampai, S.; Simantathammakul, T.; Srisawad, P.; Wongprachanukul, N.; Yan, Y.; Yu, C.; Zhang, X.; Zhu, W.; Antokhin, E.; Barnyakov, A. Yu.; Beloborodov, K.; Blinov, V. E.; Kuyanov, I. A.; Pivovarov, S.; Pyata, E.; Tikhonov, Y.; Blinov, A. E.; Kononov, S.; Kravchenko, E. A.; Lattery, M.; Boca, G.; Duda, D.; Finger, M.; Finger Jr., M.; Kveton, A.; Prochazka, I.; Slunecka, M.; Volf, M.; Jary, V.; Korchak, O.; Marcisovsky, M.; Neue, G.; Novy, J.; Tomasek, L.; Tomasek, M.; Virius, M.; Vrba, V.; Abramov, V.; Bukreeva, S.; Chernichenko, S.; Derevschikov, A.; Ferapontov, V.; Goncharenko, Y.; Levin, A.; Maslova, E.; Melnik, Y.; Meschanin, A.; Minaev, N.; Mochalov, V.; Moiseev, V.; Morozov, D.; Nogach, L.; Poslavskiy, S.; Ryazantsev, A.; Ryzhikov, S.; Semenov, P.; Shein, I.; Uzunian, A.; Vasiliev, A.; Yakutin, A.; Belostotski, S.; Fedotov, G.; Izotov, A.; Manaenkov, S.; Miklukho, O.; Cederwall, B.; Preston, M.; Tegner, P. E.; Wölbing, D.; Gandhi, K.; Rai, A. K.; Godre, S.; Crede, V.; Dobbs, S.; Eugenio, P.; Bussa, M. P.; Spataro, S.; Calvo, D.; De Remigis, P.; Filippi, A.; Mazza, G.; Wheadon, R.; Iazzi, F.; Lavagno, A.; Akram, A.; Calen, H.; Ikegami Andersson, W.; Johansson, T.; Kupsc, A.; Marciniewski, P.; Papenbrock, M.; Regina, J.; Rieger, J.; Schönning, K.; Wolke, M.; Chlopik, A.; Kesik, G.; Melnychuk, D.; Tarasiuk, J.; Wojciechowski, M.; Wronka, S.; Zwieglinski, B.; Amsler, C.; Bühler, P.; Marton, J.; Zimmermann, S.; Fischer, C. S.; Haidenbauer, J.; Hanhart, C.; Lutz, M. F. M.; Ryan, Sinéad M.
Classificazione: 1 Contributo su Rivista
Abstract: The Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany, provides unique possibilities for a new generation of hadron-, nuclear- and atomic physics experiments. The future antiProton ANnihilations at DArmstadt (PANDA or PANDA) experiment at FAIR will offer a broad physics programme, covering different aspects of the strong interaction. Understanding the latter in the nonperturbative regime remains one of the greatest challenges in contemporary physics. The antiproton–nucleon interaction studied with PANDA provides crucial tests in this area. Furthermore, the high-intensity, low-energy domain of PANDA allows for searches for physics beyond the Standard Model, e.g. through high precision symmetry tests. This paper takes into account a staged approach for the detector setup and for the delivered luminosity from the accelerator. The available detector setup at the time of the delivery of the first antiproton beams in the HESR storage ring is referred to as the Phase One setup. The physics programme that is achievable during Phase One is outlined in this paper.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/290677

Study of excited Ξ baryons with the PANDA detector
THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI
Autore/i: Barucca, G.; Davi', F.; Lancioni, G.; Mengucci, P.; Montalto, L.; Natali, P. P.; Paone, N.; Rinaldi, D.; Scalise, L.; Krusche, B.; Steinacher, M.; Li, Z.; Liu, C.; Liu, B.; Shen, X.; Sun, S.; Zhao, G.; Zhao, J.; Albrecht, M.; Alkakhi, W.; Bökelmann, S.; Coen, S.; Feldbauer, F.; Fink, M.; Frech, J.; Freudenreich, V.; Fritsch, M.; Grochowski, J.; Hagdorn, R.; Heinsius, F. H.; Held, T.; Holtmann, T.; Keshk, I.; Koch, H.; Kopf, B.; Kümmel, M.; Küner, M.; Li, J.; Linzen, L.; Maldaner, S.; Oppotsch, J.; Pankonin, S.; Pelizä, M.; Pflüger, S.; Reher, J.; Reicherz, G.; Schnier, C.; Steinke, M.; Triffterer, T.; Wenzel, C.; Wiedner, U.; Denizli, H.; Er, N.; Keskin, U.; Yerlikaya, S.; Yilmaz, A.; Bec, R.; Chauhan, V.; Hammann, C.; Hartmann, J.; Ketzer, B.; Müllers, J.; Salisbury, B.; Schmidt, C.; Thoma, U.; Urban, M.; Bianconi, A.; Bragadireanu, M.; Pantea, D.; Domagala, M.; Filo, G.; Lisowski, E.; Lisowski, F.; Michałek, M.; Poznanski, P.; Płazek, J.; Korcyl, K.; Lebiedowicz, P.; Pysz, K.; Schäfer, W.; Szczurek, A.; Firlej, M.; Fiutowski, T.; Idzik, M.; Moron, J.; Swientek, K.; Terlecki, P.; Korcyl, G.; Lalik, R.; Malige, A.; Moskal, P.; Nowakowski, K.; Przygoda, W.; Rathod, N.; Salabura, P.; Smyrski, J.; Augustin, I.; Böhm, R.; Lehmann, I.; Schmitt, L.; Varentsov, V.; Al-Turany, M.; Belias, A.; Deppe, H.; Dzhygadlo, R.; Flemming, H.; Gerhardt, A.; Götzen, K.; Heinz, A.; Jiang, P.; Karabowicz, R.; Koch, S.; Kurilla, U.; Lehmann, D.; Lühning, J.; Lynen, U.; Orth, H.; Peters, K.; Schepers, G.; Schmidt, C. J.; Schwarz, C.; Schwiening, J.; Täschner, A.; Traxler, M.; Voss, B.; Wieczorek, P.; Abazov, V.; Alexeev, G.; Barabanov, M. Yu.; Dodokhov, V. Kh.; Efremov, A.; Fechtchenko, A.; Galoyan, A.; Golovanov, G.; Koshurnikov, E. K.; Lobanov, Y. Yu.; Olshevskiy, A. G.; Piskun, A. A.; Samartsev, A.; Shimanski, S.; Skachkov, N. B.; Skachkova, A. N.; Strokovsky, E. A.; Tokmenin, V.; Uzhinsky, V.; Verkheev, A.; Vodopianov, A.; Zhuravlev, N. I.; Watts, D.; Böhm, M.; Eyrich, W.; Lehmann, A.; Miehling, D.; Pfaffinger, M.; Seth, K.; Xiao, T.; Ali, A.; Hamdi, A.; Himmelreich, M.; Krebs, M.; Nakhoul, S.; Nerling, F.; Gianotti, P.; Lucherini, V.; Bracco, G.; Bodenschatz, S.; Brinkmann, K. T.; Brück, L.; Diehl, S.; Dormenev, V.; Düren, M.; Erlen, T.; Hahn, C.; Hayrapetyan, A.; Hofmann, J.; Kegel, S.; Khalid, F.; Köseoglu, I.; Kripko, A.; Kühn, W.; Metag, V.; Moritz, M.; Nanova, M.; Novotny, R.; Orsich, P.; Pereira-de-Lira, J.; Sachs, M.; Schmidt, M.; Schubert, R.; Strickert, M.; Wasem, T.; Zaunick, H. G.; Tomasi-Gustafsson, E.; Glazier, D.; Ireland, D.; Seitz, B.; Kappert, R.; Kavatsyuk, M.; Loehner, H.; Messchendorp, J.; Rodin, V.; Kalita, K.; Huang, G.; Liu, D.; Peng, H.; Qi, H.; Sun, Y.; Zhou, X.; Kunze, M.; Azizi, K.; Olgun, A. T.; Tavukoglu, Z.; Derichs, A.; Dosdall, R.; Esmail, W.; Gillitzer, A.; Goldenbaum, F.; Grunwald, D.; Jokhovets, L.; Kannika, J.; Kulessa, P.; Orfanitski, S.; Pérez-Andrade, G.; Prasuhn, D.; Prencipe, E.; Pütz, J.; Ritman, J.; Rosenthal, E.; Schadmand, S.; Schmitz, R.; Scholl, A.; Sefzick, T.; Serdyuk, V.; Stockmanns, T.; Veretennikov, D.; Wintz, P.; Wüstner, P.; Xu, H.; Zhou, Y.; Cao, X.; Hu, Q.; Liang, Y.; Rigato, V.; Isaksson, L.; Achenbach, P.; Corell, O.; Denig, A.; Distler, M.; Hoek, M.; Lauth, W.; Leithoff, H. H.; Merkel, H.; Müller, U.; Petersen, J.; Pochodzalla, J.; Schlimme, S.; Sfienti, C.; Thiel, M.; Bleser, S.; Bölting, M.; Capozza, L.; Dbeyssi, A.; Ehret, A.; Klasen, R.; Kliemt, R.; Maas, F.; Motzko, C.; Noll, O.; Rodríguez Piñeiro, D.; Schupp, F.; Steinen, M.; Wolff, S.; Zimmermann, I.; Kazlou, D.; Korzhik, M.; Missevitch, O.; Balanutsa, P.; Chernetsky, V.; Demekhin, A.; Dolgolenko, A.; Fedorets, P.; Gerasimov, A.; Golubev, A.; Kantsyrev, A.; Kirin, D. Y.; Kristi, N.; Ladygina, E.; Luschevskaya, E.; Matveev, V. A.; Panjushkin, V.; Stavinskiy, A. V.; Balashoff, A.; Boukharov, A.; Bukharova, M.; Malyshev, O.; Vishnevsky, E.; Bonaventura, D.; Brand, P.; Hetz, B.; Hüsken, N.; Kellers, J.; Khoukaz, A.; Klostermann, D.; Mannweiler, C.; Vestrick, S.; Bumrungkoh, D.; Herold, C.; Khosonthongkee, K.; Kobdaj, C.; Limphirat, A.; Manasatitpong, K.; Nasawad, T.; Pongampai, S.; Simantathammakul, T.; Srisawad, P.; Wongprachanukul, N.; Yan, Y.; Yu, C.; Zhang, X.; Zhu, W.; Antokhin, E.; Barnyakov, A. Yu.; Beloborodov, K.; Blinov, V. E.; Kuyanov, I. A.; Pivovarov, S.; Pyata, E.; Tikhonov, Y.; Blinov, A. E.; Kononov, S.; Kravchenko, E. A.; Lattery, M.; Boca, G.; Duda, D.; Finger, M.; Finger Jr., M.; Kveton, A.; Pesek, M.; Peskova, M.; Prochazka, I.; Slunecka, M.; Volf, M.; Gallus, P.; Jary, V.; Korchak, O.; Marcisovsky, M.; Neue, G.; Novy, J.; Tomasek, L.; Tomasek, M.; Virius, M.; Vrba, V.; Abramov, V.; Bukreeva, S.; Chernichenko, S.; Derevschikov, A.; Ferapontov, V.; Goncharenko, Y.; Levin, A.; Maslova, E.; Melnik, Y.; Meschanin, A.; Minaev, N.; Mochalov, V.; Moiseev, V.; Morozov, D.; Nogach, L.; Poslavskiy, S.; Ryazantsev, A.; Ryzhikov, S.; Semenov, P.; Shein, I.; Uzunian, A.; Vasiliev, A.; Yakutin, A.; Belostotski, S.; Fedotov, G.; Izotov, A.; Manaenkov, S.; Miklukho, O.; Preston, M.; Tegner, P. E.; Wölbing, D.; Cederwall, B.; Gandhi, K.; Rai, A. K.; Godre, S.; Crede, V.; Dobbs, S.; Eugenio, P.; Calvo, D.; De Remigis, P.; Filippi, A.; Mazza, G.; Wheadon, R.; Iazzi, F.; Lavagno, A.; Bussa, M. P.; Spataro, S.; Akram, A.; Calen, H.; Ikegami Andersson, W.; Johansson, T.; Kupsc, A.; Marciniewski, P.; Papenbrock, M.; Regina, J.; Rieger, J.; Schönning, K.; Wolke, M.; Chlopik, A.; Kesik, G.; Melnychuk, D.; Tarasiuk, J.; Wronka, S.; Zwieglinski, B.; Amsler, C.; Bühler, P.; Marton, J.; Zimmermann, S.
Classificazione: 1 Contributo su Rivista
Abstract: The study of baryon excitation spectra provides insight into the inner structure of baryons. So far, most of the world-wide efforts have been directed towards N∗ and Δ spectroscopy. Nevertheless, the study of the double and triple strange baryon spectrum provides independent information to the N∗ and Δ spectra. The future antiproton experiment PANDA will provide direct access to final states containing a ΞΞ pair, for which production cross sections up to μb are expected in ¯pp reactions.With a luminosity of L = 1031 cm−2 s−1 in the first phase of the experiment, the expected cross sections correspond to a production rate of ∼ 106 events/day. With a nearly 4π detector acceptance, PANDA will thus be a hyperon factory. In this study, reactions of the type ¯pp → Ξ+Ξ∗− as well as ¯pp → Ξ∗+Ξ− with various decay modes are investigated. For the exclusive reconstruction of the signal events a full decay tree fit is used, resulting in reconstruction efficiencies between 3 and 5%. This allows high statistics data to be collected within a few weeks of data taking.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/289859

Biomechanical performances of PCL/HA micro- and macro-porous lattice scaffolds fabricated via laser powder bed fusion for bone tissue engineering
MATERIALS SCIENCE AND ENGINEERING. C, BIOMIMETIC MATERIALS, SENSORS AND SYSTEMS
Autore/i: Gatto, Maria Laura; Furlani, Michele; Giuliani, Alessandra; Bloise, Nora; Fassina, Lorenzo; Visai, Livia; Mengucci, Paolo
Classificazione: 1 Contributo su Rivista
Abstract: The present experimental study aims to extend know-how on resorbable polycaprolactone/hydroxyapatite (PCL/ HA, 70/30 wt%) scaffolds, produced by Laser Powder Bed Fusion (LPBF) technology, to geometrically complex lattice structures and micro porous struts. Using optimized LPBF printing parameters, micro- and macro-porous scaffolds for bone tissue regeneration were produced by regularly repeating in space Diamond (DO) and Rhombic Dodecahedron (RD) elementary unit cells. After production, scaffolds were submitted to structural, mechanical, and biological characterization. The interaction of scaffolds with human Mesenchymal Stem Cells (hMSCs) allowed studying the degradative processes of the PCL matrix. Biomechanical performances and biodegradation of scaffolds were compared to literature results and bone tissue data. Mechanical compression test, biological viability up to 4 days of incubation and degradation rate evidenced strong dependence of scaffold behavior on unit cell geometry as well as on global geometrical features.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/291433

Development of a reliable method for contamination detection in raw metal powders for additive manufacturing
Euro PM 2018 Congress and Exhibition
Autore/i: Santecchia, E.; Mengucci, P.; Gatto, A.; Bassoli, E.; Denti, L.; Bondioli, F.; Barucca, G.
Editore: European Powder Metallurgy Association (EPMA)
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The evolution of additive manufacturing draws a growing attention to the quality of the raw materials involved. During Powder Bed Fusion (PBF), impurities can be trapped by the melting action of the laser or electron beam followed by a rapid solidification, resulting in discontinuities of the sintered products where failure is likely to start. To increase the quality of the sintered parts, it is mandatory to minimize the presence of impurities in the final product and therefore the risk of failure under service. This result can be achieved by improving the quality of the raw metal powders, which plays a key role in the overall process. In this study, intentionally contaminated AM metal powders were characterized by coupling scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) techniques with a statistical treatment of the data, obtaining a reliable method for powder impurities detection.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/274891

Powder Bed Fusion of Biomedical Co-Cr-Mo and Ti-6Al-4V Alloys: Microstructure and Mechanical Properties
Sustainable Materials Science and Technology II
Autore/i: Santecchia, Eleonora; Mengucci, Paolo; Gatto, Andrea; Bassoli, Elena; Denti, Lucia; Rutkowski, Bogdan; Czyrska-Filemonowicz, Aleksandra; Barucca, Gianni
Editore: Antonio Macias García, Eduardo Manuel Cuerda Correa and Joaquín R. Domínguez Vargas
Classificazione: 2 Contributo in Volume
Abstract: Powder bed fusion (PBF) is an additive manufacturing technique, which allows to build complex functional mechanical parts layer-by-layer, starting from a computer-aided design (CAD) model. PBF is particularly attractive for biomedical applications, where a high degree of individualization is required. In this work, the microstructure of two biomedical alloys, namely Co- Cr-Mo and Ti-6Al-4V, were studied by X-ray diffraction and electron microscopy techniques. Hardness and tensile tests were performed on the sintered parts.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/271130

Physics of matter: from the nanoscale structure to the macroscopic properties of materials
The First outstanding 50 years of "Università Politecnica delle Marche"
Autore/i: Albertini, G.; Barucca, G.; Francescangeli, O.; Lucchetta, D. E.; Lucchetti, L.; Mengucci, P.; Rinaldi, D.; Simoni, F.; Vita, F.
Editore: Springer
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/275117

Giant magneto-optical response in H+ irradiated Zn1−xCoxO thin films
JOURNAL OF MATERIALS CHEMISTRY. C
Autore/i: Varvaro, G.; Di Trolio, A.; Polimeni, A.; Gabbani, A.; Pineider, F.; De Julián Fernández, C.; Barucca, G.; Mengucci, P.; Amore Bonapasta, A.; Testa, A. M.
Classificazione: 1 Contributo su Rivista
Abstract: Remarkable improvements in the magneto-optical properties of Zn1xCoxO thin films were achieved by post-growth hydrogen irradiation at temperatures of 400 1C. Hydrogen incorporation increases the magnetic circular dichroism signal resulting in large values of ellipticity and Faraday rotation at room temperature. The hysteretic behavior of the magneto-optical field dependent loops at different subbandgap wavelengths indicates an intrinsic ferromagnetic regime. A giant Faraday rotation of 3000 deg cm1 was observed at 400 nm. Optical, structural and microstructural characterizations pointed out the Zn substitution by Co, ruling out the presence of noticeable Co-related secondary phases down to the nanoscale. The increased values of saturation magnetization, ellipticity and Faraday rotation have been explained based on an impurity band close to the conduction band minimum, which is induced by Co–VO (O vacancies) complexes. A phenomenological model founded on such an impurity band and electronic states induced by other Co-defect complexes in the ZnO energy gap allows a thoroughly novel, fine interpretation of the ellipticity spectra.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/264281

Cross-contamination quantification in powders for additive manufacturing: A study on Ti-6Al-4V and maraging steel
MATERIALS
Autore/i: Santecchia, E.; Mengucci, P.; Gatto, A.; Bassoli, E.; Defanti, S.; Barucca, G.
Classificazione: 1 Contributo su Rivista
Abstract: Metal additive manufacturing is now taking the lead over traditional manufacturing techniques in applications such as aerospace and biomedicine, which are characterized by low production volumes and high levels of customization. While fulfilling these requirements is the strength of metal additive manufacturing, respecting the tight tolerances typical of the mentioned applications is a harder task to accomplish. Powder bed fusion (PBF) is a class of additive manufacturing in which layers of metal powder are fused on top of each other by a high-energy beam (laser or electron beam) according to a computer-aided design (CAD) model. The quality of raw powders for PBF affects the mechanical properties of additively manufactured parts strongly, and therefore it is crucial to avoid the presence of any source of contamination, particularly cross-contamination. In this study, the identification and quantification of cross-contamination in powders of Ti-6Al-4V and maraging steel was performed using scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) techniques. Experimental results showed an overall good reliability of the developed method, opening the way for applications in machine learning environments.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/269796

Co/Pd-Based synthetic antiferromagnetic thin films on Au/resist underlayers: Towards biomedical applications
NANOSCALE
Autore/i: Varvaro, G.; Laureti, S.; Peddis, D.; Hassan, M.; Barucca, G.; Mengucci, P.; Gerardino, A.; Giovine, E.; Lik, O.; Nissen, D.; Albrecht, M.
Classificazione: 1 Contributo su Rivista
Abstract: Thin film stacks consisting of multiple repeats M of synthetic antiferromagnetic (SAF) [Co/Pd]N/Ru/[Co/Pd]N units with perpendicular magnetic anisotropy were explored as potential starting materials to fabricate free-standing micro/nanodisks, which represent a promising candidate system for theranostic applications. The films were directly grown on a sacrificial resist layer spin-coated on SiOx/Si(100) substrates, required for the preparation of free-standing disks after its dissolution. Furthermore, the film stack was sandwiched between two Au layers to allow further bio-functionalization. For M ≤ 5, the samples fulfill all the key criteria mandatory for biomedical applications, i.e., zero remanence, zero field susceptibility at small fields and sharp switching to saturation, together with the ability to vary the total magnetic moment at saturation by changing the number of repetitions of the multi-stack. Moreover, the samples show strong perpendicular magnetic anisotropy, which is required for applications relying on the transduction of a mechanical force through the micro/nano-disks under a magnetic field, such as the mechanical cell disruption, which is nowadays considered a promising alternative to the more investigated magnetic hyperthermia approach for cancer treatment. In a further step, SAF microdisks were prepared from the continuous multi-stacks by combining electron beam lithography and Ar ion milling, revealing similar magnetic properties as compared to the continuous films.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/272498

Enhancing the quality of metal powder feedstock for laser PBF through cross-contamination removal
Euro PM 2019 Congress and Exhibition
Autore/i: Santecchia, E.; Mengucci, P.; Gatto, A.; Bassoli, E.; Denti, L.; Gheorghiu, B.; Barucca, G.
Editore: European Powder Metallurgy Association (EPMA)
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The presence of impurities in metal powder feedstock for laser powder bed fusion (L-PBF) can strongly affect the mechanical properties of the sintered part. As a matter of fact, the contamination particles trapped in the uniform metal matrix of the raw material, act as a discontinuity and, therefore, as a site for fatigue crack nucleation and growth, leading to a dramatic reduction of the expected fatigue life. While cross-contamination detection is a key parameter to establish the quality level of the metal powder feedstock, its removal is crucial to ensure that the sintered parts will fulfil the service requirements. In this study, metal powder feedstock for laser PBF were intentionally contaminated, submitted to a removal process based on their magnetic properties, through suitably developed equipment. The contaminated and processed powders were characterized by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) techniques.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/288862

Laser Powder Bed Fusion: tailoring the microstructure of alloys for biomedical applications
15th International Conferences and Exhibition on Nanosciences and Nanotechnologies (NN) / 11th International Symposium on Flexible Organic Electronics (ISFOE)
Autore/i: Santecchia, E; Mengucci, P; Gatto, A; Bassoli, E; Denti, L; Rutkowski, B; Barucca, G
Editore: ELSEVIER
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/272088

Characterization and Optimization of Level Measurement by an Ultrasonic Sensor System
IEEE SENSORS JOURNAL
Autore/i: Rocchi, Andrea; Santecchia, Eleonora; Ciciulla, Fabrizio; Mengucci, Paolo; Barucca, Gianni
Classificazione: 1 Contributo su Rivista
Abstract: The problem of environmental disasters due to oil spills has characterized recent history from the early '900, still being an important risk factor for environmental protection. Aim of this research is designing and implementation of a non-contact ultrasonic sensor system capable of providing the water level in the marine environment. This system is part of a very low-cost device developed to detect water pollution by non-conductive liquids (i.e., hydrocarbons floating in the sea), exploiting the different conductivities of fluids involved. While equipment and techniques currently used for monitoring marine water pollution are very expensive, this paper focuses on the characterization of a low-cost SRF05 ultrasonic sensor and on its implementation inside a floating organ as a result of data obtained from laboratory tests. A number of experimental tests were conducted using a micrometric linear stage, a triangulation laser, a digital oscilloscope, and a post-processing software. Moreover, changes of climatic conditions, such as temperature and humidity, were monitored in a climatic chamber, aiming to establish the best operating range in terms of sensor resolution and the architecture of a buoy. The sensor showed signal anomalies at regular distance intervals due to anticipated flight times, which led to the adoption of a sensor system consisting in the combination of more SRF05 sensors to optimize the measurement system. In addition, it is presented an analytical method based on ultrasonic signal reconstruction, with the aim to improve the accuracy of the measurement method. The final device is managed to have a sensibility of about 1 mm.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/264665

Quality Control and Structural Assessment of Anisotropic Scintillating Crystals
CRYSTALS
Autore/i: Montalto, Luigi; Natali, PIER PAOLO; Scalise, Lorenzo; Paone, Nicola; Davi', Fabrizio; Rinaldi, Daniele; Barucca, Gianni; Mengucci, Paolo
Classificazione: 1 Contributo su Rivista
Abstract: Nowadays, radiation detectors based on scintillating crystals are used in many different fields of science like medicine, aerospace, high energy physic and security. The scintillating crystals are the core elements of these devices; by converting high energy radiations in visible photons, they produce the optical signals to be detected and analyzed. Structural and surface conditions, defects and residual stress states play a crucial role in their operating performances like light production, transport and extraction. Industrial production of such crystalline materials is a complex process which requires sensing, in-line and off-line, for material characterization and process control to properly tune the production parameters. Indeed, scintillators quality must be accurately assessed during their manufacturing in order to prevent malfunction and failures at each level of the chain, optimizing the production and utilization costs. This paper presents an overview of the techniques used, at various stages, across the crystal production process, to assess quality and structural condition of anisotropic scintillating crystals. Different inspection techniques (XRD, SEM, EDX, TEM) and the non-invasive photoelasticity based methods for residual stress detection, such as Laser Conoscopy and Sphenoscopy, are presented. The use of XRD, SEM, EDX and TEM analytical methods offer detailed structural and morphological information. Conoscopy and Sphenoscopy offer the advantages of fast and non-invasive measurement methods suitable for the inspection of the whole crystal quality. These techniques, based on different measurement methods and models, provide different information which can be cross-correlated to obtain a complete characterization of the scintillating crystals. Inspection methods will be analyzed and compared in relation to present state of the art.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/267755

Solid-state phase transformations in thermally treated Ti-6Al-4V alloy fabricated via laser powder bed fusion
MATERIALS
Autore/i: Mengucci, P.; Santecchia, E.; Gatto, A.; Bassoli, E.; Sola, A.; Sciancalepore, C.; Rutkowski, B.; Barucca, G.
Classificazione: 1 Contributo su Rivista
Abstract: Laser Powder Bed Fusion (LPBF) technology was used to produce samples based on the Ti-6Al-4V alloy for biomedical applications. Solid-state phase transformations induced by thermal treatments were studied by neutron diffraction (ND), X-ray diffraction (XRD), scanning transmission electron microscopy (STEM) and energy-dispersive spectroscopy (EDS). Although, ND analysis is rather uncommon in such studies, this technique allowed evidencing the presence of retained β in α' martensite of the as-produced (#AP) sample. The retained β was not detectable byXRDanalysis, nor by STEM observations. Martensite contains a high number of defects, mainly dislocations, that anneal during the thermal treatment. Element diffusion and partitioning are the main mechanisms in the α ↔ β transformation that causes lattice expansion during heating and determines the final shape and size of phases. The retained β phase plays a key role in the α' → β transformation kinetics.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270246

PANI/Au/Fe3O4 nanocomposite materials for high performance energy storage
ELECTROCHIMICA ACTA
Autore/i: Ballarin, B.; Boanini, E.; Montalto, L.; Mengucci, P.; Nanni, D.; Parise, C.; Ragazzini, I.; Rinaldi, D.; Sangiorgi, N.; Sanson, A.; Cassani, M. C.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270303

Precipitates formation and evolution in a Co-based alloy produced by powder bed fusion
JOURNAL OF ALLOYS AND COMPOUNDS
Autore/i: Santecchia, E.; Gatto, A.; Bassoli, E.; Denti, L.; Rutkowski, B.; Mengucci, P.; Barucca, G.
Classificazione: 1 Contributo su Rivista
Abstract: Metal additive manufacturing is strongly employed in aerospace and biomedical applications, whose high degree of customization and low production volumes are the main characteristics. Cobalt-based alloys have been widely used for dental prosthesis and can be produced via metal additive manufacturing, or rather powder bed fusion, in a more convenient way compared to traditional manufacturing techniques. In the present paper, a comprehensive study of the tight correlation between the microstructure and the static mechanical properties of Co-Cr-Mo-W samples produced by powder bed fusion, is reported. In particular, the formation of precipitates during the sintering process is observed, and the evolution of their size, shape and frequency due to post-processing and to a heat-treatment typical of dental applications, is exhaustively studied. By coupling different characterization techniques such as scanning transmission electron microscopy and small-angle neutron scattering, it was possible to correlate the ductility degradation of the samples with the formation and growth of coarse and elongated precipitates.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/266706

Optimization of distances measurement by an ultrasonic sensor
15th International Conferences and Exhibition on Nanosciences and Nanotechnologies (NN) / 11th International Symposium on Flexible Organic Electronics (ISFOE)
Autore/i: Rocchi, A; Santecchia, E; Barucca, G; Mengucci, P
Editore: ELSEVIER
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/272089

Fatigue life and microstructure of additive manufactured Ti6Al4V after different finishing processes
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Autore/i: Denti, L.; Bassoli, E.; Gatto, A.; Santecchia, E.; Mengucci, P.
Classificazione: 1 Contributo su Rivista
Abstract: Finishing methods of additive manufactured metal parts are becoming a key driver of industrial viability, increasingly with additive processes being challenged in demanding end-product applications. The same scenario stresses the requirements as to fatigue life of parts built by Additive Manufacturing (AsM). The paper addresses fatigue life of Ti6Al4V produced by Powder Bed Fusion in four finishing conditions: as-built, tool machined, after tumbling and after tumbling and subsequent shot-peening. Failure mechanisms at the micro-scale are observed in order to reinforce the mechanical results by identifying the role of different surface morphologies in crack initiation. X-ray diffraction (XRD), scanning electron microscopy (SEM) techniques and microanalysis (EDX) are used to investigate microstructural modifications generated by the different finishing methods. Results show that tumbling alone does not improve fatigue life against the as built condition, whereas tumbling and subsequent shot peening allow matching the fatigue endurance of tool machined specimens. The shot peening process causes surface amorphization and implantation of the peening media turning into subsurface inclusions. Based on the results, an optimized finishing process can be envisaged, consisting in prolonged tumbling up to the removal of a stock allowance at least equal to the powder size, before shot peening.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/264744

Precision resonance energy scans with the PANDA experiment at FAIR
THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI
Autore/i: Barucca, G; Davı, F; Lancioni, G; Mengucci, P; Montalto, L; Natali, P; Paone, N; Rinaldi, D; Scalise, L; Erni, W; Krusche, B; Steinacher, M; Walford, N; Cao, N; Liu, Z; Liu, C; Liu, B; Shen, X; Sun, S; Tao, J; Zhao, G; Zhao, J; Albrecht, M; Bökelmann, S; Erlen, T; Feldbauer, F; Fink, M; Frech, J; Freudenreich, V; Fritsch, M; Hagdorn, R; Heinsius, H; Held, T; Holtmann, T; Keshk, I; Koch, H; Kopf, B; Kuhlmann, M; Kümmel, M; Küßner, M; Leiber, S; Musiol, P; Mustafa, A; Pelizäus, M; Pitka, A; Reher, J; Reicherz, G; Richter, M; Schnier, C; Sersin, S; Sohl, L; Sowa, C; Steinke, M; Triffterer, T; Weber, T; Wiedner, U; Beck, R; Hammann, C; Hartmann, J; Ketzer, B; Müllers, J; Rossbach, M; Salisbury, B; Schmidt, C; Thoma, U; Urban, M; Bianconi, A; Bragadireanu, M; Pantea, D; Czyzycki, W; Domagala, M; Filo, G; Jaworowski, J; Krawczyk, M; Lisowski, E; Lisowski, F; Michałek, M; Płażek, J; Korcyl, K; Kozela, A; Kulessa, P; Lebiedowicz, P; Pysz, K; Schäfer, W; Szczurek, A; Fiutowski, T; Idzik, M; Swientek, K; Terlecki, P; Korcyl, G; Lalik, R; Malige, A; Moskal, P; Nowakowski, K; Przygoda, W; Rathod, N; Rudy, Z; Salabura, P; Smyrski, J; Augustin, I; Böhm, R; Lehmann, I; Nicmorus Marinescu, D; Schmitt, L; Varentsov, V; Al-Turany, M; Belias, A; Deppe, H; Dzhygadlo, R; Flemming, H; Gerhardt, A; Götzen, K; Heinz, A; Karabowicz, R; Kurilla, U; Lehmann, D; Lühning, J; Lynen, U; Nakhoul, S; Orth, H; Peters, K; Saito, T; Schepers, G; Schmidt, C J; Schwarz, C; Schwiening, J; Täschner, A; Traxler, M; Voss, B; Wieczorek, P; Abazov, V; Alexeev, G; Arefiev, V A; Astakhov, V; Barabanov, M Yu; Batyunya, B V; Dodokhov, V Kh; Fechtchenko, A; Galoyan, A; Golovanov, G; Koshurnikov, E K; Lobanov, Y Yu; Olshevskiy, A G; Piskun, A A; Samartsev, A; Shimanski, S; Skachkov, N B; Skachkova, A N; Strokovsky, E A; Tokmenin, V; Uzhinsky, V; Verkheev, A; Vodopianov, A; Zhuravlev, N I; Branford, D; Glazier, D; Watts, D; Böhm, M; Eyrich, W; Lehmann, A; Miehling, D; Pfaffinger, M; Stelter, S; Quin, N; Robison, L; Seth, K; Xiao, T; Bettoni, D; Ali, A; Hamdi, A; Krebs, M; Nerling, F; Belousov, A; Kisel, I; Kozlov, G; Pugach, M; Zyzak, M; Bianchi, N; Gianotti, P; Lucherini, V; Bracco, G; Bodenschatz, S; Brinkmann, K T; Diehl, S; Dormenev, V; Düren, M; Etzelmüller, E; Föhl, K; Galuska, M; Geßler, T; Gutz, E; Hahn, C; Hayrapetyan, A; Kesselkaul, M; Kühn, W; Lange, J S; Liang, Y; Metag, V; Moritz, M; Nanova, M; Novotny, R; Schmidt, M; Stenzel, H; Strickert, M; Thöring, U; Wasem, T; Wohlfahrt, B; Zaunick, H G; Tomasi-Gustafsson, E; Ireland, D; Seitz, B; Deepak, P N; Kulkarni, A; Apostolou, A; Kappert, R; Kavatsyuk, M; Loehner, H; Messchendorp, J; Rodin, V; Schakel, P; Vejdani, S; Dutta, K; Kalita, K; Sohlbach, H; Bianchi, L; Deermann, D; Derichs, A; Dosdall, R; Erven, A; Gillitzer, A; Goldenbaum, F; Grunwald, D; Jokhovets, L; Lai, A; Orfanitski, S; Prasuhn, D; Prencipe, E; Pütz, J; Ritman, J; Rosenthal, E; Schadmand, S; Schmitz, R; Sefzick, T; Serdyuk, V; Sterzenbach, G; Stockmanns, T; Wintz, P; Wüstner, P; Xu, H; Zhou, Y; Cao, X; Hu, Q; Li, H; Li, Z; Ma, X; Rigato, V; Isaksson, L; Achenbach, P; Aycock, A; Corell, O; Denig, A; Distler, M; Hoek, M; Lauth, W; Liu, Z; Merkel, H; Müller, U; Pochodzalla, J; Schlimme, S; Sfienti, C; Thiel, M; Zambrana, M; Ahmadi, H; Ahmed, S; Bleser, S; Bölting, M; Capozza, L; Dbeyssi, A; Grasemann, P; Klasen, R; Kliemt, R; Leithoff, H H; Maas, F; Maldaner, S; Michel, M; Morales Morales, C; Motzko, C; Noll, O; Pflüger, S; Rodríguez Piñeiro, D; Steinen, M; Wolff, S; Zimmermann, I; Fedorov, A; Korzhik, M; Missevitch, O; Balashoff, A; Boukharov, A; Malyshev, O; Balanutsa, P; Chernetsky, V; Demekhin, A; Dolgolenko, A; Fedorets, P; Gerasimov, A; Golubev, A; Goryachev, V; Kantsyrev, A; Kirin, D Y; Kotov, A; Kristi, N; Ladygina, E; Luschevskaya, E; Matveev, V A; Panjushkin, V; Stavinskiy, A V; Basant, K N; Jha, V; Kumawat, H; Mohanty, A K; Roy, B; Saxena, A; Yogesh, S; Bonaventura, D; Fritzsch, C; Grieser, S; Hargens, C; Hergemöller, A K; Hetz, B; Hüsken, N; Khoukaz, A; Wessels, J P; Herold, C; Khosonthongkee, K; Kobdaj, C; Limphirat, A; Nasawad, T; Simantathammakul, T; Srisawad, P; Yan, Y; Blinov, A E; Kononov, S; Kravchenko, E A; Antokhin, E; Barnyakov, M; Beloborodov, K; Blinov, V E; Kuyanov, I A; Pivovarov, S; Pyata, E; Tikhonov, Y; Kunne, R; Ramstein, B; Boca, G; Duda, D; Finger, M; Finger, M; Kveton, A; Pesek, M; Peskova, M; Prochazka, I; Slunecka, M; Gallus, P; Jary, V; Novy, J; Tomasek, M; Tomasek, L; Virius, M; Vrba, V; Abramov, V; Bukreeva, S; Chernichenko, S; Derevschikov, A; Ferapontov, V; Goncharenko, Y; Levin, A; Maslova, E; Melnik, Y; Meschanin, A; Minaev, N; Mochalov, V; Moiseev, V; Morozov, D; Nogach, L; Poslavskiy, S; Ryazantsev, A; Ryzhikov, S; Semenov, P; Shein, I; Uzunian, A; Vasiliev, A; Yakutin, A; Roy, U; Yabsley, B; Belostotski, S; Gavrilov, G; Izotov, A; Manaenkov, S; Miklukho, O; Veretennikov, D; Zhdanov, A; Makonyi, K; Preston, M; Tegner, P E; Wölbing, D; Atac, A; Bäck, T; Cederwall, B; Gandhi, K; Rai, A K; Godre, S; Calvo, D; De Remigis, P; Filippi, A; Mazza, G; Rivetti, A; Wheadon, R; Iazzi, F; Lavagno, A; Bussa, M P; Spataro, S; Martin, A; Akram, A; Calen, H; Ikegami Andersson, W; Johansson, T; Kupsc, A; Marciniewski, P; Papenbrock, M; Regina, J; Schönning, K; Wolke, M; Diaz, J; Pothodi Chackara, V; Chlopik, A; Kesik, G; Melnychuk, D; Trzcinski, A; Wojciechowski, M; Wronka, S; Zwieglinski, B; Amsler, C; Bühler, P; Kratochwil, N; Marton, J; Nalti, W; Steinschaden, D; Suzuki, K; Widmann, E; Zimmermann, S; Zmeskal, J
Classificazione: 1 Contributo su Rivista
Abstract: This paper summarises a comprehensive Monte Carlo simulation study for precision resonance energy scan measurements. Apart from the proof of principle for natural width and line shape measurements of very narrow resonances with PANDA, the achievable sensitivities are quantified for the concrete example of the charmonium-like X(3872) state discussed to be exotic, and for a larger parameter space of various assumed signal cross-sections, input widths and luminosity combinations. PANDA is the only experiment that will be able to perform precision resonance energy scans of such narrow states with quantum numbers of spin and parities that differ from {$} J^{{}PC{}} = 1^{{}--{}}{$}JPC=1--.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/264613

Influence of a Surface Finishing Method on Light Collection Behaviour of PWO Scintillator Crystals
PHOTONICS
Autore/i: Rinaldi, Daniele; Montalto, Luigi; Lebeau, Michel; Mengucci, Paolo
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/262514

Theoretical and experimental evaluation of piezo-optic parameters and photoelastic constant in Tetragonal PWO
APPLIED OPTICS
Autore/i: Natali, PIER PAOLO; Montalto, Luigi; Daví, Fabrizio; Mengucci, Paolo; Ciriaco, Andrea; Paone, Nicola; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Abstract: The tetragonal PbWO4 (PWO) is one of the most important scintillating crystals, being used both into CMS at CERN and in the PANDA project at FAIR. Light yield and other relevant scintillation properties depend, among many factors, also on the crystal mechanical quality. Accordingly, a detailed knowledge of crystal piezo-optic properties is a mandatory step towards understanding its the elasto-optic behaviour and to perform crystal quality control. In this paper we evaluatefor the first time, by means of both from photoelastic and X-ray measurements, some components of the piezo-optic tensor; moreover, when the crystal is acted upon by an uniaxial stress, we obtain an evaluation for angle of rotation angle of the optic plane under stress as well as the photoelastic constant. These parameters are necessary in order to detect the residual stresses within the crystal, if any, and to give an overall quality measure. Such a methodology is in general suitable for any tetragonal crystals.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252420

The role of cryogenic dipping prior to ECAP in the microstructure, secondary-phase precipitation, mechanical properties and corrosion resistance of AA6012 (Al-Mg-Si-Pb)
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Autore/i: Cabibbo, M.; Santecchia, E.; Mengucci, P.; Bellezze, T.; Vicere', Annamaria
Classificazione: 1 Contributo su Rivista
Abstract: Literature on ECAP generally deals with room temperature or high-temperature deformation regimes. Very few data on low-temperature SPD processes have been published. This study presents some experimental results on the effect of cryogenic treatment prior to ECAP-BC on microstructure modification, mechanical response, and corrosion behaviour of an AA6012 Al-Mg-Si-Pb alloy. This type of Pb-bearing AA6000-series alloy, is produced and used for its marked post-extrusion machinability. The mechanical properties were inferred by nanoindentation to measure hardness, H, and local elastic modulus, Er. These data were presented in form of maps to account for the whole H and Er evolution with cumulative strain. The experimental results showed significant microstructure differences between the cryogenic treated ECAP condition and the conventional ECAP at room temperature. These differences were also correlated with electron microscopy inspections, XRD. Finally, the cryogenic treatment prior ECAP also affected the alloy corrosion behaviour.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/253727

Barium and lithium silicate glass ceramics doped with rare earth ions for white LEDs
OPTICAL MATERIALS
Autore/i: Trusova, E.; Vaitkevičius, A.; Tratsiak, Y.; Korjik, M.; Mengucci, P.; Rinaldi, D.; Montalto, L.; Marciulionyte, V.; Tamulaitis, G.
Classificazione: 1 Contributo su Rivista
Abstract: Novel glasses and glass ceramics with compositions corresponding to stoichiometric lithium and barium dis- ilicates and doped with different combinations of Ce3+, Eu2+,3+, Tb3+, and Dy3+ have been fabricated and studied as prospective light converters for white high-power light emitting diodes and laser diodes. Spatially resolved photoluminescence spectroscopy and structural analysis have been employed. The emission spectra and CIE color coordinates of these materials evidence their good prospective as phosphors for white light sources. Structural analysis proves a high level of crystallization of the ceramics fabricated by annealing the glasses, while spectroscopic study revealed the influence of crystallization on the emission properties of this system. The results show a high potential of these materials be exploited as temperature-resistant phosphors in high-power white light emitting diodes.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/261546

Direct metal laser sintering of biomedical Co-Cr-Mo and Ti-6Al-4V alloys: microstructure and mechanical properties.
Abstract book 2nd International Conference on Sustainable Materials Science and Technology (SMST”), 19-21 July, Canary Islands (SPAIN)
Autore/i: Barucca, G.; Mengucci, P.; Gatto, A.; Bassoli, E.; Denti, L.; Rutkowski, B.; Czyrska-Filemonowicz, A.; Fiori, F.; Girardin, E.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/263111

Structural Characterization and Absolute Luminescence Efficiency Evaluation of Gd2O2S High Packing Density Ceramic Screens Doped with Tb3+ and Eu3+ for further Applications in Radiology
JOURNAL OF PHYSICS. CONFERENCE SERIES
Autore/i: Dezi, Anna; Monachesi, Elenasophie; D'Ignazio, Michela; Scalise, Lorenzo; Montalto, Luigi; Paone, Nicola; Rinaldi, Daniele; Mengucci, Paolo; Loudos, George; Bakas, Athanasios; Michail, Christos; Valais, Ioannis; Fountzoula, Christine; Fountos, George; David, Stratos
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/254632

Effects of build orientation and element partitioning on microstructure and mechanical properties of biomedical Ti-6Al-4V alloy produced by laser sintering
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Autore/i: Mengucci, Paolo; Gatto, A.; Bassoli, E.; Denti, L.; Fiori, Fabrizio; Girardin, Emmanuelle; Bastianoni, Piergiorgio; Rutkowski, B.; Czyrska Filemonowicz, A.; Barucca, Gianni
Classificazione: 1 Contributo su Rivista
Abstract: Direct Metal Laser Sintering (DMLS) technology was used to produce tensile and flexural samples based on the Ti-6Al-4V biomedical composition. Tensile samples were produced in three different orientations in order to investigate the effect of building direction on the mechanical behavior. On the other hand, flexural samples were submitted to thermal treatments to simulate the firing cycle commonly used to veneer metallic devices with ceramics in dental applications. Roughness and hardness measurements as well as tensile and flexural mechanical tests were performed to study the mechanical response of the alloy while X-ray diffraction (XRD), electron microscopy (SEM, TEM, STEM) techniques and microanalysis (EDX) were used to investigate sample microstructure. Results evidenced a difference in the mechanical response of tensile samples built in orthogonal directions. In terms of microstructure, samples not submitted to the firing cycle show a single phase acicular α’ (hcp) structure typical of metal parts subject to high cooling rates. After the firing cycle, samples show a reduction of hardness and strength due to the formation of laths of the β (bcc) phase at the boundaries of the primary formed α’ plates as well as to lattice parameters variation of the hcp phase. Element partitioning during the firing cycle gives rise to high concentration of V atoms (up to 20 wt%) at the plate boundaries where the β phase preferentially forms.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/239995

Characterization of a defective PbWO$_4$ crystal cut along the a-c crystallographic plane: structural assessment and a novel photoelastic stress analysis
JOURNAL OF INSTRUMENTATION
Autore/i: Montalto, Luigi; Natali, PIER PAOLO; Davi', Fabrizio; Mengucci, Paolo; Paone, Nicola; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Abstract: Among scintillators, the PWO is one of the most widely used, for instance in CMS calorimeter at CERN and PANDA project. Crystallographic structure and chemical composition as well as residual stress condition, are indicators of homogeneity and good quality of the crystal. In this paper, structural characterization of a defective PbWO$_4$ (PWO) crystal has been performed by X-ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS) and Photoelasticity in the unusual $(a, c)$ crystallographic plane. XRD and EDS analysis have been used to investigate crystallographic orientation and chemical composition, while stress distribution, which indicates macroscopic inhomogeneities and defects, has been obtained by photoelastic approaches, in Conoscopic and Sphenoscopic configuration. Since the sample is cut along the $(a, c)$ crystallographic plane, a new method is proposed for the interpretation of the fringe pattern. The structural analysis has detected odds from the nominal lattice dimension, which can be attributed to the strong presence of Pb and W. A strong inhomogeneity over the crystal sample has been revealed by the photoelastic inspection. The results give reliability to the proposed procedure which is exploitable in crystals with other structures.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252357

A new micromechanical approach for the preparation of graphene nanoplatelets deposited on polyethylene
NANOTECHNOLOGY
Autore/i: Coscia, U.; Palomba, M.; Ambrosone, G.; Barucca, Gianni; Cabibbo, Marcello; Mengucci, Paolo; De Asmundis, R.; Carotenuto, G.
Classificazione: 1 Contributo su Rivista
Abstract: An advantageous micromechanical technique to deposit large area graphene nanoplatelet (GNP) thin films on a low-density polyethylene substrate is proposed. This method is based on the application of shear-stress and friction forces to a graphite platelets/ethanol paste on the surface of a polymeric substrate; it allows us to obtain a continuous film of superimposed nanoplatelets mainly made of 13–30 graphene layers. X-ray diffraction (XRD), atomic force and transmission electron microscopy (TEM) measurements support the occurrence of a partial exfoliation of the graphite platelets due to shear-stress and friction forces applied during film formation. Scanning electron microscopy (SEM) observations point out that the surface of the polymer is uniformly coated by the overlap of GNPs, and TEM analysis reveals the tendency of the nanoplatelets to align parallel to the interface plane. It has been found that the deposited samples, under white light illumination, exhibit a negative photoconductivity and a linear photoresponse as a function of the applied voltage and the optical power density in the −120÷120 mV and 20.9÷286.2 mWcm−2 ranges, respectively.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246670

Trans-cis photoisomerization in nanostructured floating layers and x-ray diffraction study of Langmuir-Schaefer films of nonyloxypheylazocinnamic acid
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
Autore/i: Pisani, Michela; Maiorova, L. A.; Francescangeli, Oriano; Fokin, D. M. S.; Nikitin, K. S.; Burmistrov, V. A.; Kuvshinova, S. A.; Mengucci, Paolo; Koifman, O. I.
Classificazione: 1 Contributo su Rivista
Abstract: Azo-functionalised materials are of special interest due to their photochromic nature, i.e. reversible trans–cis isomerisation upon photoirradiation. The structure and properties of Langmuir monolayers of nonyloxyphenylazocinnamic acid (NOPACA) with and without exposure to UV-irradiation were studied. The NOPACA floating layer structure was determined by using a quantitative method of compression isotherm analysis. The results showed that the structure of two dimensional face-on M-nanoaggregates, the stable structural elements of floating monolayers, changes when exposed to UV-irradiation. Langmuir-Schaefer films of NOPACA were prepared by deposition of floating layers and studied using X-ray diffraction technique.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/250593

Effects of thermal treatments on microstructure and mechanical properties of a Co-Cr-Mo-W biomedical alloy produced by laser sintering
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Autore/i: Mengucci, Paolo; Barucca, Gianni; Gatto, A.; Bassoli, E.; Denti, L.; Fiori, Fabrizio; Girardin, Emmanuelle; Bastianoni, Piergiorgio; Rutkowski, B.; Czyrska Filemonowicz, A.
Classificazione: 1 Contributo su Rivista
Abstract: Direct Metal Laser Sintering (DMLS) technology based on a layer by layer production process was used to produce a Co-Cr-Mo-W alloy specifically developed for biomedical applications. The alloy mechanical response and microstructure were investigated in the as-sintered state and after post-production thermal treatments. Roughness and hardness measurements, and tensile and flexural tests were performed to study the mechanical response of the alloy while X-ray diffraction (XRD), electron microscopy (SEM, TEM, STEM) techniques and microanalysis (EDX) were used to investigate the microstructure in different conditions. Results showed an intricate network of -Co (hcp) lamellae in the γ-Co (fcc) matrix responsible of the high UTS and hardness values in the as-sintered state. Thermal treatments increase volume fraction of the -Co (hcp) martensite but slightly modify the average size of the lamellar structure. Nevertheless, thermal treatments are capable of producing a sensible increase in UTS and hardness and a strong reduction in ductility. These latter effects were mainly attributed to the massive precipitation of an hcp Co3(Mo,W)2Si phase and the contemporary formation of Si-rich inclusions.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/233357

Biomedical Co-Cr-Mo Components Produced by Direct Metal Laser Sintering
Materials Today: Proceedings
Autore/i: Girardin, Emmanuelle; Barucca, Gianni; Mengucci, Paolo; Fiori, Fabrizio; Bassoli, E.; Gatto, A.; Iuliano, L.; Rutkowski, B.
Editore: ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Direct Metal Laser Sintering (DMLS) is an additive manufacturing technique based on a laser power source that sinters powdered materials using a 3D CAD model. The mechanical components produced by this procedure typically show higher residual porosity and poorer mechanical properties than those obtained by traditional manufacturing techniques. In this study, samples were produced by DMLS starting from a Co-Cr-Mo powder (in the γ phase) with a composition suitable for biomedical applications. Samples were submitted to hardness measurements and structural characterization. The samples showed a hardness value remarkably higher that those commonly obtained for the same cast or wrought alloys. In fact, the HRC value measured for the samples is 47 HRC, while the usual range for CAST Co-Cr-Mo is from 25 to 35 HRC. The samples microstructure was investigated by X-ray diffraction (XRD), electron microscopy (SEM and TEM) and energy dispersive microanalysis (EDX) in order to clarify the origin of this unexpected result. The laser treatment induced a melting of the metallic Co-Cr-Mo powder, generating a phase transformation from the γ (fcc) to the ɛ (hcp) phase. The rapid cooling of the melted powder produced the formation of ɛ (hcp) nano-lamellae inside the γ (fcc) phase. The nano-lamellae formed an intricate network responsible for the measured hardness increase. The results suggest possible innovative applications of the DMLS technique to the production of mechanical parts in the medical and dental fields, where a high degree of personalization is required.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/235710

Biomedical Co-Cr-Mo Components Produced by Direct Metal Laser Sintering
Conference Book for COST MP1005 - International Conference on Unified Scientific Approaches towards Regenerative Dentistry and Orthopaedics - REDEOR
Autore/i: Barucca, Gianni; Girardin, Emmanuelle; Mengucci, Paolo; Fiori, Fabrizio; Bassoli, E.; Gatto, A.; Iuliano, L.; Rutkowski, B.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251539

Biomedical metal alloys produced by direct metal laser sintering
Proceedings of EUROMAT 2015, Warsaw (PL)
Autore/i: Barucca, Gianni; Bassoli, E.; Denti, L.; Fiori, Fabrizio; Gatto, A.; Girardin, Emmanuelle; Mengucci, Paolo
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251538

Synthesis and characterization of PLD CoFe thin films as a function of composition and deposition conditions
Proceedings of Magnet 2015, Bologna (IT)
Autore/i: Peddis, D.; Barucca, Gianni; Varvaro, G.; Testa, A. M.; Mengucci, Paolo; Agostinelli, E.; Laureti, S.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251533

Direct metal laser sintering of a biomedical Co-based alloy
Atti del Congresso Nazionale Biomateriali (SIB) 2015
Autore/i: Barucca, Gianni; Elena, Bassoli; Lucia, Denti; Andrea, Gatto; Girardin, Emmanuelle; Bogdan, Rutkowski; Mengucci, Paolo
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251540

Structural, mechanical and light yield characterisation of heat treated LYSO:Ce single crystals for medical imaging applications.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT
Autore/i: Mengucci, Paolo; G., André; E., Auffray; Barucca, Gianni; C., Cecchi; R., Chipaux; A., Cousson; Davi', Fabrizio; N., Di Vara; Rinaldi, Daniele; Santecchia, Eleonora
Classificazione: 1 Contributo su Rivista
Abstract: Five single crystals of cerium-doped lutetium yttrium oxyorthosilicate (LYSO:Ce) grown by the Czochralski method were submitted to structural characterization by X-ray (XRD) and neutron (ND) diffraction, scanning (SEM) and transmission (TEM) electron microscopy and energy dispersive microanalysis (EDS).The Ultimate Tensile Strength (UTS), the Young Modulus (YM) and the Light Yield (LY) of the samples were also measured in order to correlate the mechanical and the optical behavior of the crystals with the characteristics of their microstructure. Two of the samples analysed were also heat treated at 300°C for 10 h to evidence possible variations induced by the temperature in the optical and mechanical response of the crystals. Results showed that the mean compositional variations evidenced by the structural analyses do not affect the mechanical and optical behavior of the samples. On the contrary, the therma treatment could induce the formation of coherent spherical particles (size 10 to 15 nm), not uniformly distributed inside the sample, that strongly reduce the UTS and YM values, but it does not affect the optical response of the crystal. This latter result was attributed to the low value o fthe heating temperature (300 °C) that is not sufficiently high to induce annealing of the oxygen vacancies traps that are responsible of the deterioration of the scintillation properties of the LYSO:Ce crystals. This study was carried out in the framework of the Crystal Clear Collaboration (CCC).
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/221515

Structural characterization of biomedical Co-Cr-Mo components produced by Direct Metal Laser Sintering.
MATERIALS SCIENCE AND ENGINEERING. C, BIOMIMETIC MATERIALS, SENSORS AND SYSTEMS
Autore/i: Barucca, Gianni; Santecchia, Eleonora; Majni, Giuseppe; Girardin, Emmanuelle; Elena, Bassoli; Lucia, Denti; Andrea, Gatto; Luca, Iuliano; Tomasz, Moskalewicz; Mengucci, Paolo
Classificazione: 1 Contributo su Rivista
Abstract: Direct metal laser sintering (DMLS) is a technique to manufacture complex functional mechanical parts from a computer-aided design (CAD) model. Usually, the mechanical components produced by this procedure show higher residual porosity and poorer mechanical properties than those obtained by conventional manufacturing techniques. In this work, a Co-Cr-Mo alloy produced by DMLS with a composition suitable for biomedical applications was submitted to hardness measurements and structural characterization. The alloy showed a hardness value remarkably higher than those commonly obtained for the same cast or wrought alloys. In order to clarify the origin of this unexpected result, the sample microstructure was investigated by X-ray diffraction (XRD), electron microscopy (SEM and TEM) and energy dispersive microanalysis (EDX). For the first time, a homogeneous microstructure comprised of an intricate network of thin ε (hcp)-lamellae distributed inside a γ (fcc) phase was observed. The ε-lamellae grown on the {111}γ planes limit the dislocation slip inside the γ (fcc) phase, causing the measured hardness increase. The results suggest possible innovative applications of the DMLS technique to the production of mechanical parts in the medical and dental fields.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/221915

Highly Textured FeCo Thin Films Deposited by Low Temperature Pulsed Laser Deposition
ACS APPLIED MATERIALS & INTERFACES
Autore/i: Varvaro, Gaspare; Peddis, Davide; Barucca, Gianni; Mengucci, Paolo; Rodionova, Valeria; Chichay, Ksenia; Testa, Alberto Maria; Agostinelli, Elisabetta; Laureti, Sara
Classificazione: 1 Contributo su Rivista
Abstract: The effect of the deposition temperature (Tdep) on the crystallographic orientation of pulsed laser-deposited FeCo/MgO(100) thin film was determined by means of X-ray reflectivity and high resolution trasmission electron microscopy analysis and was correlated with the magnetic anisotropy properties measured by angle dependent hysteresis loops. Highly textured films with a bcc structure and very smooth surface were obtained even at room temperature, the film being [100] and [110] oriented, at Tdep = 25 °C and 150 °C, respectively. The cubic symmetry is reflected in the angular dependence of remanent magnetization, showing a 4-fold character, whose in-plane distribution is consistent with the different crystallographic orientations of the films. The high structural quality, even at room temperature, is reflected in a high value of the saturation magnetization and low coercivity, matching the requirements for technological applications.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/230133

Biomedical alloys produced by direct metal laser sintering
Multinational Conference on Microscopy 2015 (MCM 2015)
Autore/i: Mengucci, Paolo; Barucca, Gianni; Gatto, A.; Bassoli, E.; Iuliano, L.; Rutkowski, B.
Luogo di pubblicazione: Eger
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Direct Metal Laser Sintering (DMLS) is an advanced manufacturing technology based on layer-by-layer deposition for the production of complex functional mechanical parts. In the DMLS technology, a solid-state laser controlled by a scanning system sinters successive layers of a metal powder in accordance to the previously realized CAD/CAM model. In the biomedical field, DMLS is a promising technology for prosthetic applications where complex geometries, low volumes and strong individualization are required. Co- and Ti-based alloys are extensively used in biomedical applications due to their mechanical properties and biocompatibiliy. In this study, a Co-Cr-Mo composition suitable for biomedical applications and a Ti-6Al-4V alloy were produced by the DMLS technology. In order to study the structure stability of the alloys, samples were submitted to thermal treatments.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/235064

Method and device for detecting the water pollution
Autore/i: Barucca, Gianni; Mengucci, Paolo; Tiberi, Emanuele
Classificazione: 6 Brevetti
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/249954

Microstructure and Intermetallic Strengthening in an Equal Channel Angular Pressed AA2219. Part I: Microstructure Characterization
METALLOGRAPHY, MICROSTRUCTURE, AND ANALYSIS
Autore/i: Santecchia, E.; Mengucci, Paolo; Cabibbo, Marcello
Classificazione: 1 Contributo su Rivista
Abstract: In the present work, the strengthening effect of the Fe-rich intermetallic phases in a 2219 aluminium alloy subjected to equal channel angular pressing (ECAP) has been studied. Three different deformation conditions, corresponding to the as-extruded, ECAP route A-1 pass and ECAP route A-2 passes were considered. Microstructural characterization has been performed by light microscopy, transmission electron microscopy and scanning electron microscopy observations. All the contributions to the alloy strengthening, including solid solution, dislocation boundary, very fine particle precipitation induced by the adiabatic heating, equilibrium θ = Al2Cu secondary phase particles and the effect of the Fe-rich intermetallics, are discussed in this work. The resulting strengthening was evaluated and modelled in Part II.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/201917

Kinetic behaviour of a metal-polymer composite suitable for hydrogen storage applications
INTERNATIONAL JOURNAL OF NANOTECHNOLOGY
Autore/i: Santecchia, E.; Barucca, Gianni; Majni, Giuseppe; Mengucci, Paolo; Checchetto, R.; Carotenuto, G.
Classificazione: 1 Contributo su Rivista
Abstract: Hydrogen storage in composite materials is a feasible way to overcome the main drawbacks of the metal hydride systems. In the present paper, we report on the hydrogenation properties of three polydimethylsiloxane (PDMS)–palladium composite samples with different content of metallic fraction (5, 15, 50 in wt.%). Hydrogenation tests in different conditions of temperature and pressure were performed using a Sievert’s type apparatus, while the microstructure of the samples was characterised by means of scanning electron microscopy observations and X-ray diffraction measurements. Results show that the hydrogen storage capacity is inversely proportional to the metallic content in the composite samples.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/179340

Dispositivo e Metodo per Rilevare l’Inquinamento delle Acque
Autore/i: Barucca, Gianni; Mengucci, Paolo; Tiberi, Emanuele
Classificazione: 6 Brevetti
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/249937

Characterization of cerium-doped LYSO scintillating crystals
Proceedings of Microscopy Conference (MC) 2013, Regensburg (D), Part 1
Autore/i: Santecchia, Eleonora; Barucca, Gianni; DI CRISTOFORO, Adriano; Rinaldi, Daniele; Tiberi, Emanuele; Mengucci, Paolo
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251529

Silicon nanostructures produced by self-masked plasma etching.
Proceedings of Multinational Conference (MC) 2013, Regensburg (D), Part 1
Autore/i: Barucca, Gianni; Santecchia, Eleonora; Mengucci, Paolo; Tiberi, Emanuele; Di Mundo, R.; D'Agostino, R.; F., Palumbo
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251530

Hydrogen storage behaviour of Pd-polymer composites.
Proceedings of Multinational Conference (MC) 2013, Regensburg (D), Part 1
Autore/i: Mengucci, Paolo; Barucca, Gianni; Carotenuto, G.; Checchetto, R.; DI CRISTOFORO, Adriano; Miotello, A.; Santecchia, Eleonora
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251528

Direct metal laser sintering of a biocompatible Co-Cr-Mo alloy.
Proceedings of Multinational Conference (MC) 2013, Regensburg (D), Part 1
Autore/i: Girardin, Emmanuelle; Barucca, Gianni; Santecchia, Eleonora; Mengucci, Paolo; Moskalewicz, T.; Gatto, A.; Bassoli, E.; Denti, L.; Iuliano, L.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251532

Microstructural investigation of magnetic CoCrPt:SiO2 films.
Proceedings of Multinational Conference (MC) 2013, Regensburg (D), Part 1
Autore/i: Santecchia, Eleonora; Barucca, Gianni; Mengucci, Paolo; Varvaro, G.; Testa, A. M.; Agostinelli, E.; Springer, F.; Brombacher, C.; Albrecht, M.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251531

Magnesium growth in magnesium deuteride thin films during deuterium desorption
JOURNAL OF ALLOYS AND COMPOUNDS
Autore/i: Checchetto, R.; Miotello, A.; Mengucci, Paolo; Barucca, Gianni
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/155111

Study Of Microstructure And Magnetization Reversal Mechanism In Granular CoCrPt:SiO2 Films Of Variable Thickness
MATERIALS CHEMISTRY AND PHYSICS
Autore/i: G., Varvaro; A. M., Testa; E., Agostinelli; D., Fiorani; S., Laureti; F., Springer; C., Brombacher; M., Albrecht; L., Del Bianco; Barucca, Gianni; Mengucci, Paolo; Rinaldi, Daniele
Classificazione: 1 Contributo su Rivista
Abstract: The effect of the thickness and microstructural features on the switching behaviour of granular CoCrPt:SiO2 films with perpendicular magnetic anisotropy was investigated. TEM plane view and cross section analysis indicate that, while the very first layers grow as uniform nanograins in close contact, the growth proceeds by formation of well-defined CoCrPt columnar islands (7 nm average size) separated by the silicon oxide, the distance among the islands remaining roughly constant along the whole thickness. The relation between such non-uniform microstructure and the magnetization reversal mechanism at room temperature was investigated by performing hysteresis loops at variable angle as well as time dependent measurements by using a vector vibrating sample magnetometer. Numerical micromagnetic simulations of the hysteresis loops have been carried out to support the description of the experimental observations. The results showed a coexistence of coherent and incoherent reversal processes, the former being more and more pronounced with increasing the magnetic layer thickness, consistently with the microstructural investigations.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/105863

Superconducting and structural properties of Nb films covered by plasma enhanced chemical vapour deposited a-Si:H layers for superconducting qubit application
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Autore/i: Bruno, A.; Mengucci, Paolo; Mercaldo, L. V.; Lisitskiy, M. P.
Classificazione: 1 Contributo su Rivista
Abstract: With a view to the fabrication of superconducting qubits with low decoherence time, we have investigated the influence of a-Si:H deposition by the plasma enhanced chemical vapor deposition method at 250◦C on the superconducting and structural properties of a 20 nm thick Nb film treated by two surface protection methods: plasma nitridation and deposition of a thin unhydrogenated Si layer. A suppression of theTc and an increase of the residual resistivity are observed due to hydrogen diffusion and decomposition of the native surface oxide, with subsequent oxygen diffusion caused by sample heating. The unhydrogenated Si layer is found to efficiently protect the Nb films against both diffusion processes.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/86553

Evaluation of an automated system for root canal irrigation: a scanning electron microscopy study
DENTAL MATERIALS JOURNAL
Autore/i: MATTIOLI BELMONTE CIMA, Monica; Orsini, Giovanna; Giuliodori, F; DI CRISTOFORO, Adriano; Procaccini, Maurizio; Mengucci, Paolo; Putignano, Angelo
Classificazione: 1 Contributo su Rivista
Abstract: This study evaluated a new automated system using alternative irrigants for root canal cleaning treatments. This method relies on a system inserting an enzymatic solution based on Trypsin fl owing inside the pulp chambers and root canals, completely avoiding traditional endodontic instrumentation. Sixty freshly extracted human molar teeth were randomly divided into 4 groups to assess 3 regimens (R1-3) differing in 0.25% Trypsin/EDTA and 5% Sodium Hypochlorite (NaOCl) solutions administration. Scanning electron microscopy observations and scores taking into account changes in dentin tubules were used to assess treatment effects in pulp chambers and roots. Signifi cant changes in root cleaning ability relative to administration timing were observed, with the best results found in R3, with scheduled alternated cycles of Trypsin/EDTA and NaOCl inside the tooth. The non-invasive root canal method demonstrates good teeth cleaning ability independent of root morphology. This equipment may provide lower discomfort levels for patients undergoing endodontic treatment.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/82239

Investigation of the superconducting properties of Nb films covered with PECVD a-Si:H layers for superconducting qubit application
PHYSICS PROCEDIA
Autore/i: A., Bruno; Mengucci, Paolo; L. V., Mercaldo; M. P., Lisitskiy
Classificazione: 1 Contributo su Rivista
Abstract: Hydrogenated amorphous silicon (a-Si:H) grown by PECVD has a lower loss tangent (tanδ) among conventional dielectrics(suchasSiO2 andSiNx)andhenceisconsideredasthebestamorphousdielectricmaterialforsuperconducting qubit application. The incorporation of PECVD a-Si:H into the Nb technology requires attention due to the possible degradationofthesuperconductivityoftheNbfilms. Superconductingtransitiontemperature(Tc)andresidualresistivity(ρ0)of20nm,50nmand100nmthickNbfilmsweremeasuredbeforeandaftera-Si:Hdeposition. Thepenetration ofoxygenandhydrogeninsidetheNbfilmswasevaluatedfromthevariationofthelatticeparameterobtainedbyX-ray diffraction. The high process temperature (250◦ C) and the presence of energetic hydrogen ions during the a-Si:H layer growthcausedadecreaseofTc andincreaseofρ0 throughtwophysicalprocesses: 1)oxygendiffusionfromthesurface Nb oxides and 2) hydrogen diffusion inside the Nb films. The degradation of Tc was reduced with the increase of the filmthickness. NitridationofNbfilmsanddepositionofasputteredthinamorphoussiliconlayer(a-Si)ontheNbfilms (in both cases made in situ after the Nb film deposition) were investigated as surface treatments to protect the Nb films during PECVD. It was demonstrated that both methods markedly reduce oxygen and hydrogen diffusion into Nb films during a-Si:H deposition, but the a-Si layer was more effective to protect the Nb films.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/63386

Niobium aggregation and vacancylike defect evolution in nanostructured Nb-doped Mg: Their role in the kinetics of the hydride-to-metal phase transformation
PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Autore/i: Macchi, C.; Maurizio, C.; Checchetto, R.; Mariazzi, S.; Ravelli, L.; Egger, W.; Mengucci, Paolo; Bazzanella, N.; Miotello, A.; Somoza, A.; Brusa, R. S.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/72829

Single step plasma deposition of hydrocarbon thin films containing Pt nanoclusters for fuel cells applications
Proceedings of 10th Multinational Congress on Microscopy
Autore/i: Barucca, Gianni; Santecchia, E.; Mengucci, Paolo; Milella, A.; Palumbo, F.
Editore: Kennedy srl
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/69904

Effects of sorption cycles on the microstructure of Mg-Nb films
Proceedings of 10th Multinational Congress on Microscopy
Autore/i: Santecchia, Eleonora; Barucca, Gianni; Gobbi, Luigi; Mengucci, Paolo; R., Checchetto
Editore: Kennedy srl
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/199302

Precipitation sequence in a QE22 magnesium alloy.
MICROSCOPIE
Autore/i: Barucca, Gianni; DI CRISTOFORO, Adriano; Lussana, D.; Mengucci, Paolo; Santecchia, Eleonora
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/76460

Structure modification of Mg-Nb films under hydrogen sorption cycles
JOURNAL OF ALLOYS AND COMPOUNDS
Autore/i: Mengucci, Paolo; Barucca, Gianni; Majni, Giuseppe; Bazzanella, N.; Checchetto, R.; Miotello, A.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/54697

Enhanced kinetics of hydride-metal phase transition in magnesium by vacancy clustering
PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Autore/i: R., Checchetto; N., Bazzanella; A., Kale; A., Miotello; S., Mariazzi; R. S., Brusa; Mengucci, Paolo; C., Macchi; A., Somoza; W., Egger; L., Ravelli
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/66551

Formation and evolution of the hardening precipitates in a Mg-Y-Nd alloy
ACTA MATERIALIA
Autore/i: Barucca, Gianni; Ferragut, R.; Fiori, Fabrizio; Lussana, D.; Mengucci, Paolo; Moia, F.; Riontino, G.
Classificazione: 1 Contributo su Rivista
Abstract: The formation and evolution of hardening precipitates in a Mg-Y-Nd (WE43) alloy during artificial ageing at 150 and 210 °C is followed by small angle X-ray scattering (SAXS) measurements, Vickers microhardness tests and transmission electron microscopy (TEM) observations. A quantitative description of the alloy studied during the early and advanced stages of the precipitation sequence is presented. In situ SAXS evolution at 210 °C of the size, volume fraction and number density of the subnanometer and nanometer particles that evolve in the β″ phase was obtained. TEM and microhardness results indicate that the hardening mechanism is based on β″ transformation of pre-precipitates and their growth at 150 °C, while at 210 °C hardening is mainly associated with β″ → β′ transformation.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/54588

Plasma deposited Pt-containing hydrocarbon thin films as electrocatalysts for PEM fuel cell.
JOURNAL OF MATERIALS CHEMISTRY
Autore/i: Dilonardo, E; Milella, A; Palumbo, F; Thery, J; Martin, S; Barucca, Gianni; Mengucci, Paolo; D'Agostino, R; Fracassi, F.
Editore: Royal Society of Chemistry:Thomas Graham House, Science Park, Cambridge CB4 0WF United Kingdom:011 44 1223 432360, EMAIL: sales@rsc.org, INTERNET: http://www.rsc.org, http://www.chensoc.org, Fax: 011 44 1223 423429
Classificazione: 1 Contributo su Rivista
Abstract: High performance electrocatalytic hydrocarbon thin films containing Pt nano-clusters are deposited by simultaneous plasma polymerization of ethylene and sputtering of a Pt target. The proposed synthetic approach largely simplifies the PEMFC electrocatalyst fabrication process with respect to conventional methods. The deposition of the hydrocarbon matrix provides the mechanical support and electronic continuity, ensuring a uniform metal dispersion, avoiding Pt nanoparticle agglomeration. The Pt catalyst is dispersed as small vertically stacked clusters with size less than 10 nm in columnar thin (250-500 nm) films. PEMFC testing with plasma deposited 500 nm thick film and 0.513 mg cm-2 Pt load as anodic electrocatalyst led to a maximum reproducible power density as high as 300 mW cm-2. © 2010 The Royal Society of Chemistry.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/41114

Structural, electrical and optical characterization of laser deposited nanometric iron oxide films
JOURNAL OF VACUUM SCIENCE AND TECHNOLOGY. B, NANOTECHNOLOGY & MICROELECTRONICS
Autore/i: Caricato, A. P.; Gorbachuk, N. T.; Korduban, A. M.; Leggieri, G; Luches, A; Mengucci, P.; Mulenko, S. A.; Valerini, D.
Editore: Slack Incorporated:6900 Grove Road:Thorofare, NJ 08086:(800)257-8290, (856)848-1000, EMAIL: customerservice@slackinc.com, INTERNET: http://www.slackinc.com, Fax: (856)853-5991
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/32688

Hardening Phases Evolution in the QE22 Magnesium Alloy.
Proceedings of MC 2009.
Autore/i: Barucca, Gianni; A., DI CRISTOFORO; L., Gobbi; D., Lussana; Mengucci, Paolo; G., Riontino
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/46533

HYDROGEN SORPTION KINETICS IN THE Nb: ROLE OF Nb CLUSTERING AND OPEN VOLUME DEFECTS FORMATION
PHYSICA STATUS SOLIDI. C
Autore/i: Toniutti, L; Checchetto, R; Mengucci, Paolo; Miotello, A; Brusa, R. S.
Editore: Weinheim : Wiley-VCH-Verl..
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/32687

Phase transformations in QE22 Mg alloy
ACTA MATERIALIA
Autore/i: Barucca, Gianni; Ferragut, R; Lussana, D; Mengucci, Paolo; Moia, F; Riontino, G.
Classificazione: 1 Contributo su Rivista
Abstract: The precipitation sequence in a QE22 Mg alloy is followed by differential scanning calorimetry, microhardness, electrical resistivity, positron annihilation spectroscopy and transmission electron microscopy (TEM) observations, after different thermal treatments. The decomposition of the supersaturated solid solution occurs via the formation of nanosized coherent structures (GP zones) followed by the co-precipitation of two metastable phases responsible for the peak ageing condition. The stable phase (Mg, Ag)12Nd appears at the highest annealing times, leading to over-ageing and hardness reduction. TEM observations provide information on the crystallographic structure of the forming phases, allowing some inconsistencies present in the literature to be clarified. Activation energies are derived from both calorimetric and resistometric measurements at different scanning rates.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53265

Structure evolution of EV31 Mg alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
Autore/i: G., Riontino; D., Lussana; M., Massazza; Barucca, Gianni; Mengucci, Paolo; R., Ferragut
Classificazione: 1 Contributo su Rivista
Abstract: Structure modifications and precipitation hardening of EV31 Mg alloy have been monitored by calorimetric measurements (DSC), TEM observations and positron annihilation spectroscopy (PAS). At the early stages of precipitation DSC measurements andTEMobservations evidenced the formation of a phase, while the presence of an intermediate is supported by positron data. Overageing is correlated to the formation of an incoherent 1 phase, which transforms in situ into the equilibrium precipitate.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52223

Structure evolution of a WE43 Mg alloy submitted to different thermal treatments.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Autore/i: Mengucci, Paolo; Barucca, Gianni; G., Riontino; D., Lussana; M., Massazza; R., Ferragut; E., HASSAN ALY
Classificazione: 1 Contributo su Rivista
Abstract: The structure evolution of the WE43 Mg alloy during different thermal treatments is studied by differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and positron annihilation spectroscopy (PAS). Isothermal annealings at different temperatures are made, with the aim to correlate the alloy's structure with its hardness response and to compare these treatments to the standard industrial T6 one (16 h at 250 °C). The highest hardening effect is obtained with a treatment at 210 °C with the formation of both β″ and β′ phases. A residual amount of solute atoms into the matrix after each thermal treatment promotes the renucleation of β″ and β′. The standard T6 treatment mainly leads to the precipitation of the β′ phase, while the thermal treatment at 280 °C essentially promotes the formation of the equilibrium β phase.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/52729

H2 STORAGE EFFICIENCY AND SORPTION KINETICS IN COMPOSITE MATERIALS
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Autore/i: Checchetto, R; Bazzanella, N; Miotello, A; Mengucci, Paolo
Editore: Elsevier Science Limited:Oxford Fulfillment Center, PO Box 800, Kidlington Oxford OX5 1DX United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: asianfo@elsevier.com, tcb@elsevier.co.UK, INTERNET: http://www.elsevier.com, http://www.elsevier.com/locate/shpsa/, Fax: 011 44 1865 843010
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/32685

A novel thermal treatment on Mg-4.2Y-2.3Nd-0.6Zr (WE43) alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Autore/i: G., Riontino; M., Massazza; D., Lussana; Mengucci, Paolo; Barucca, Gianni; R., Ferragut
Classificazione: 1 Contributo su Rivista
Abstract: A double-stage thermal treatment has been adopted on a Mg-Y-Nd-Zr (WE43) alloy, following suggestions of a previous calorimetric investigation. A secondary precipitation is claimed to occur at a temperature as low as 150 °C after a preliminary precipitation at 210 °C, with the effect of enhancing the hardness increase and reducing the annealing times.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/53471

Evolution of Hardening Precipitates in a WE43 Magnesium Alloy.
Proceedings of 8th Multinational Congress on Microscopy.
Autore/i: Mengucci, Paolo; Barucca, Gianni; A., DI CRISTOFORO; D., Lussana; M., Massazza
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/46592

Precipitation Hardening of the EV31 Magnesium Alloy.
Proceedings of 8th Multinational Congress on Microscopy.
Autore/i: Mengucci, Paolo; Barucca, Gianni; A., DI CRISTOFORO; D., Lussana; M., Massazza
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/46534

Morphological and structural characterization of CrSi2 nanometric films deposited by laser ablation.
APPLIED SURFACE SCIENCE
Autore/i: Caricato, A. P.; Leggieri, G; Luches, A; Romano, F; Barucca, Gianni; Mengucci, Paolo; Mulenko, S. A.
Classificazione: 1 Contributo su Rivista
Abstract: The structure and morphology of chromium disilicide (CrSi2) nanometric films grown on 〈1 0 0〉 silicon substrates both at room temperature (RT) and at 740 K by pulsed laser ablation are reported. A pure CrSi2 crystal target was ablated with a KrF excimer laser in vacuum (∼3 × 10-5 Pa). Morphological and structural properties of the deposited films were investigated using Rutherford backscattering spectrometry (RBS), grazing incidence X-ray diffraction (GID), X-ray reflectivity (XRR), scanning (SEM) and transmission electron microscopy (TEM). From RBS analysis, the films' thickness resulted of ∼40 nm. This value is in agreement with the value obtained from XRR and TEM analysis (∼42 and ∼38 nm, respectively). The films' composition, as inferred from Rutherford Universal Manipulation Program simulation of experimental spectra, is close to stoichiometric CrSi2. GID analysis showed that the film deposited at 740 K is composed only by the CrSi2 phase. The RT deposited sample is amorphous, while GID and TEM analyses evidenced that the film deposited at 740 K is poorly crystallised. The RT deposited film exhibited a metallic behaviour, while that one deposited at 740 K showed a semiconductor behaviour down to 227 K.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51420

Catalytic properties on the hydrogen desorption process of metallic additives dispersed in the MgH2 matrix
JOURNAL OF ALLOYS AND COMPOUNDS
Autore/i: Checchetto, R; Bazzanella, N; Miotello, A; Mengucci, Paolo
Editore: Elsevier BV:PO Box 211, 1000 AE Amsterdam Netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, EMAIL: nlinfo-f@elsevier.nl, INTERNET: http://www.elsevier.nl, Fax: 011 31 20 4853598
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/33069

Hardening nanostructures in an AlZnMg alloy
PHILOSOPHICAL MAGAZINE
Autore/i: Dupasquier, A; Ferragut, R; Iglesias, M. M.; Massazza, M; Riontino, G; Mengucci, Paolo; Barucca, Gianni; Macchi, C. E.; Somoza, A.
Classificazione: 1 Contributo su Rivista
Abstract: The formation of nanoscale and sub-nanoscale solute aggregates (clusters, Guinier–Preston zones and precipitates) in an AlZnMg alloy (Al–2.1 at.% Zn–1.5 at.% Mg) has been followed by a combination of experimental techniques with the aim of correlating the properties of the aggregates with their thermal history. The choice of thermal treatments was guided by the results of mechanical and calorimetric characterizations, supported by transmission electron microscopy for the identification of the morphology of the aggregates. Positron annihilation spectroscopy (using two variants of this technique, coincidence Doppler broadening and lifetime spectroscopy) was adopted for determining the local chemistry in the proximity of open volume defects. The geometrical parameters of the distribution (size, volume fraction, numerical density of the solute aggregates) were obtained by small-angle X-ray scattering. The results of the investigation provide new information regarding: two families of vacancy-rich clusters formed during or immediately after quenching; Guinier–Preston zones formed at 95C after room-temperature pre-ageing; growth of 0 and phases at 150C; solute clusters formed at room-temperature in conditions of secondary ageing after preliminary heating at 150C.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/51890

Fex-Ni100-x nanometric films deposited by laser ablation on Si/SiO2 substrates
APPLIED SURFACE SCIENCE
Autore/i: Berling, D; Caricato, Ap; Denys, E; Fernandez, M; Leggieri, G; Luby, S; Luches, A; Martino, M; Mengucci, Paolo
Editore: Elsevier BV:PO Box 211, 1000 AE Amsterdam Netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, EMAIL: nlinfo-f@elsevier.nl, INTERNET: http://www.elsevier.nl, Fax: 011 31 20 4853598
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/33068

Light collection dependence on polishing method
Proceedings of the 8th International Conference on Inorganic Scintillators and their Use in Scientific and Industrial Applications
Autore/i: M., Lebeau; C., Armataffet; A., Ciriaco; A., DI CRISTOFORO; Mengucci, Paolo; R., Paramatti; Rinaldi, Daniele
Editore: National Academy of Sciences of Ukraine
Luogo di pubblicazione: KHARKOV
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/49030