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GUIDO PAOLICELLI

DIPENDENTE ALTRO ENTE DI RICERCA
Dipartimento di Scienze Fisiche, Informatiche e Matematiche sede ex-Fisica

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Pubblicazioni

2024 - Effect of Mo content on the microstructure and mechanical properties of CoCrFeNiMox HEA coatings deposited by high power impulse magnetron sputtering [Articolo su rivista]
Zin, V.; Montagner, F.; Miorin, E.; Mortalo, C.; Tinazzi, R.; Bolelli, G.; Lusvarghi, L.; Togni, A.; Frabboni, S.; Gazzadi, G.; Mescola, A.; Paolicelli, G.; Armelao, L.; Deambrosis, S. M.
abstract

In this work, CoCrFeNiMox high entropy alloy (HEA) films were deposited by High Power Impulse Magnetron Sputtering (HiPIMS) using pure Mo and equiatomic CoCrFeNi targets. The effect of Mo content on the microstructure, residual stress state, and mechanical properties of the films was investigated in the range of 0–20 at.%. All films exhibited a columnar growth morphology and a high density of planar defects. Increasing the Mo content promoted the formation of a fine-grained structure and induced the transformation from a single face-centered cubic (FCC) phase to a mixture of FCC and body-centered cubic (BCC) phases. All produced films displayed a compressive residual stress state regardless of the Mo concentration. In terms of mechanical properties, the hardness of the films increased with increasing Mo content due to solid solution and grain boundary strengthening, along with the formation of a hard BCC phase. On the other hand, the elastic modulus decreased, likely due to the formation of an amorphous phase at higher Mo concentrations.

2024 - Initial stages of growth and electronic properties of epitaxial SrF2 thin films on Ag(1 1 1) [Articolo su rivista]
Borghi, M.; Mescola, A.; Paolicelli, G.; Montecchi, M.; D'Addato, S.; Vacondio, S.; Bursi, L.; Ruini, A.; Doyle, B. P.; Grasser, T.; Pasquali, L.
abstract

2023 - Friction and wear of DLC films deposited on additive manufactured AlSi10Mg: the role of surface finishing [Articolo su rivista]
Salerno, E.; Casotti, D.; Paolicelli, G.; Gualtieri, E.; Ballestrazzi, A.; Gazzadi, G. C.; Bolelli, G.; Lusvarghi, L.; Valeri, S.; Rota, A.
abstract

2023 - Influence of chirality on the aggregation of a new A-π-D-π-A small molecule with a benzodithiophene core: Spectroscopic and morphological investigations [Articolo su rivista]
Parenti, Francesca; Capelli, Raffaella; Mucci, Adele; Mortalò, Cecilia; Paolicelli, Guido; Pigani, Laura; Vanossi, Davide; Caselli, Monica
abstract

2023 - Thermoelectric and Structural Properties of Sputtered AZO Thin Films with Varying Al Doping Ratios [Articolo su rivista]
Isram, Muhammad; MAGRIN MAFFEI, Riccardo; Demontis, Valeria; Martini, Leonardo; Forti, Stiven; Coletti, Camilla; Bellani, Vittorio; Mescola, Andrea; Paolicelli, Guido; Rota, Alberto; Benedetti, Stefania; DI BONA, Alessandro; Ribeiro, Joana M.; Tavares, C. J.; Rossella, Francesco
abstract

2021 - Graphene Confers Ultralow Friction on Nanogear Cogs [Articolo su rivista]
Mescola, A.; Paolicelli, G.; Ogilvie, S. P.; Guarino, R.; McHugh, J. G.; Rota, A.; Iacob, E.; Gnecco, E.; Valeri, S.; Pugno, N. M.; Gadhamshetty, V.; Rahman, M. M.; Ajayan, P.; Dalton, A. B.; Tripathi, M.
abstract

Friction-induced energy dissipation impedes the performance of nanomechanical devices. Nevertheless, the application of graphene is known to modulate frictional dissipation by inducing local strain. This work reports on the nanomechanics of graphene conformed on different textured silicon surfaces that mimic the cogs of a nanoscale gear. The variation in the pitch lengths regulates the strain induced in capped graphene revealed by scanning probe techniques, Raman spectroscopy, and molecular dynamics simulation. The atomistic visualization elucidates asymmetric straining of C-C bonds over the corrugated architecture resulting in distinct friction dissipation with respect to the groove axis. Experimental results are reported for strain-dependent solid lubrication which can be regulated by the corrugation and leads to ultralow frictional forces. The results are applicable for graphene covered corrugated structures with movable components such as nanoelectromechanical systems, nanoscale gears, and robotics.

2021 - Zno thin films growth optimization for piezoelectric application [Articolo su rivista]
Polewczyk, V.; Magrin Maffei, R.; Vinai, G.; Lo Cicero, M.; Prato, S.; Capaldo, P.; Dal Zilio, S.; Di Bona, A.; Paolicelli, G.; Mescola, A.; D'addato, S.; Torelli, P.; Benedetti, S.
abstract

The piezoelectric response of ZnO thin films in heterostructure-based devices is strictly related to their structure and morphology. We optimize the fabrication of piezoelectric ZnO to reduce its surface roughness, improving the crystalline quality, taking into consideration the role of the metal electrode underneath. The role of thermal treatments, as well as sputtering gas composition, is investigated by means of atomic force microscopy and x-ray diffraction. The results show an optimal reduction in surface roughness and at the same time a good crystalline quality when 75% O2 is introduced in the sputtering gas and deposition is performed between room temperature and 573 K. Subsequent annealing at 773 K further improves the film quality. The introduction of Ti or Pt as bottom electrode maintains a good surface and crystalline quality. By means of piezoelectric force microscope, we prove a piezoelectric response of the film in accordance with the literature, in spite of the low ZnO thickness and the reduced grain size, with a unipolar orientation and homogenous displacement when deposited on Ti electrode.

2020 - Informing MS patients on treatment options: a consensus on the process of consent taking [Articolo su rivista]
Tortorella, C; Solaro, C; Annovazzi, P; Boffa, L; Buscarinu, M C; Buttari, F; Calabrese, M; Cavalla, P; Cocco, E; Cordioli, C; De Luca, G; Di Filippo, M; Fantozzi, R; Ferraro, D; Gajofatto, A; Gallo, A; Lanzillo, R; Laroni, A; Fermo, S Lo; Malucchi, S; Maniscalco, G T; Moccia, M; Nociti, V; Paolicelli, D; Pesci, I; Prosperini, L; Ragonese, P; Tomassini, V; Clerici, V L A Torri; Rodegher, M; Gherardi, M; Gasperini, C
abstract

In the last years, change in multiple sclerosis (MS) therapeutic scenario has highlighted the need for an improved doctor-patient communication in advance of treatment initiation in order to allow patient's empowerment in the decision-making process. Aims The aims of our project were to review the strategies used by Italian MS specialists to inform patients about treatment options and to design a multicentre shared document that homogenizes the information about disease-modifying treatment (DMTs) and the procedure of taking informed consent in clinical practice. Results The new resource, obtained by consensus among 31 neurologists from 27 MS Centres in Italy with the supervision of a medico-legal advisor, received the aegis of Italian Neurological Society (SIN) and constitutes a step toward a standardized decision process around DMTs in MS.

2018 - Friction and Adhesion of Different Structural Defects of Graphene [Articolo su rivista]
Tripathi, M.; Awaja, F.; Bizao, R. A.; Signetti, S.; Iacob, E.; Paolicelli, G.; Valeri, S.; Dalton, A.; Pugno, N. M.
abstract

Graphene structural defects, namely edges, step-edges, and wrinkles, are susceptible to severe mechanical deformation and stresses under tribo-mechanical operations. Applied forces may cause deformation by folding, buckling, bending, and tearing of these defective sites of graphene, which lead to a remarkable decline in normal and friction load bearing capacity. In this work, we experimentally quantified the maximum sustainable normal and friction forces, corresponding to the damage thresholds of the different investigated defects as well as their pull-out (adhesion) forces. Horizontal wrinkles (with respect to the basal plane, i.e., folded) sustained the highest normal load, up to 317 nN, during sliding, whereas for vertical (i.e., standing) wrinkles, step-edges, and edges, the load bearing capacities are up to 113, 74, and 63 nN, respectively. The related deformation mechanisms were also experimentally investigated by varying the normal load up to the initiation of the damage from the defects and extended with the numerical results from molecular dynamics and finite element method simulations.

2015 - Nanoscale frictional behavior of graphene on SiO2and Ni(111) substrates [Articolo su rivista]
Paolicelli, G.; Tripathi, M.; Corradini, V.; Candini, A.; Valeri, S.
abstract

Friction characteristics of graphene deposited on different substrates have been studied by atomic force microscopy (AFM). In particular, we compared mechanically exfoliated graphene transferred over Si/SiO2 with respect to monolayer (ML) graphene grown in our laboratory by low temperature chemical vapor deposition on Ni(111) single crystal. Friction force measurements by AFM have been carried out as function of load under different environment conditions, namely vacuum (10-5 Torr), nitrogen and air. The typical decrease of friction force with increasing number of layers has been observed on graphene over Si/SiO2 in all environment including vacuum. Continuum mechanical approximation has been used to analyze the friction versus load curves of ML graphene on Ni(111). Analysis shows that Derjaguin-Mueller-Toporov model is in good agreement with our experimental data indicating that overall behavior of the interface graphene-Ni(111) is relatively rigid respect to out of plane deformations. This result is consistent with the structural characteristics of the interface since graphene grows in registry with Ni(111) surface with covalent bonding character. Finally, the shear strength and the work of adhesion of the two systems with respect to AFM tip in vacuum have been compared. The result of this procedure indicates that shear strength and work of adhesion measured on graphene-Si/ SiO2 interface are always greater than those on graphene-Ni(111) interface.