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Featured researches published by Vittorio Violante.


Physics Letters A | 2000

Temperature coefficient of resistivity at compositions approaching PdH

Paolo Tripodi; Michael C. H. McKubre; Francis L. Tanzella; P.A. Honnor; D. Di Gioacchino; Francesco Celani; Vittorio Violante

Abstract Measurements have been made of the temperature coefficient of resistivity, λ , versus hydrogen concentration, H/Pd, at very high concentrations in the Pd–H system. Unusually high hydrogen compositions were achieved using an electrochemical loading procedure which allowed stable Pd–H systems to be obtained. It is well known that increasing the H/Pd concentrations leads to three different phases ( α , α + β , β ), respectively, in the Pd–H system; the β phase is thought to end in an asymptotic limit. Possible evidence that a new phase ( γ ) exists, bordering the β phase at compositions H/Pd > 0.9 is reported and discussed.


Journal of The Optical Society of America B-optical Physics | 2009

Light scattering from a rough metal surface: theory and experiment

Roberto Li Voti; G. Leahu; Simone Gaetani; C. Sibilia; Vittorio Violante; E. Castagna; M. Bertolotti

There is still great interest in the determination of microtopographic properties of rough metallic surfaces from light scattering measurements. According to Beckmann-Kirchhoff theory a clear relationship is established between the in-plane angular scattered light intensity and the statistical properties of the surface. We discuss one way to invert this relationship, and we introduce a new iterative procedure to retrieve the height autocorrelation function even for a very rough metallic surface (rms surface roughness of the same order of the optical wavelength). The procedure is eventually applied to the experimental data of a known metallic surface for validation.


Journal of Alloys and Compounds | 1997

Deformations induced by high loading ratios in palladium–deuterium compounds

A. De Ninno; A. La Barbera; Vittorio Violante

Abstract The strong concentration gradients produced during the loading process in palladium hydride are responsible for the well known difficulty in obtaining high loading ratios (H(D)/Pd≈1). Experiments on electrolytic loading of palladium with deuterium have been carried out in which the loading ratio was monitored through a four wire resistance technique. Preliminary results show that dynamic loading strongly affects the maximum ratio achievable.


International Journal of Hydrogen Energy | 2003

Steady-state concentration profiles of hydrogen in tubular metallic membranes

Alessandra Adrover; Massimiliano Giona; Luigi Capobianco; P. Tripodi; Vittorio Violante

Abstract This article analyzes the stress-induced diffusion (SID) model for hydrogen transport in thin cylindrical membranes when the planar approximation, usually adopted in the literature, is relaxed. The SID model, explicitly formulated for a cylindrical membrane predicts a non-linear steady-state concentration profile, characterized by a concentration gradient at the inner surface which can be significantly lower than the macroscopic concentration gradient imposed, depending on the initial hydrogen content of the membrane. We provide analytical arguments to show that this effect is due to the fact that concentration-induced stresses do not relax at steady state, and this is a peculiar feature of thin hollow cylinders, not occurring in thin plates.


Metamaterials | 2006

Electromagnetic Field Enhancement at Electrochemical Interface Due to Surface Defects on a Metallic Electrode

A. Mandatori; E. Castagna; Vittorio Violante; Concita Sibilia; M. Bertolotti

Strong electromagnetic field localization can be obtained at the electrode/electrolyte interface of dielectric inclusions in a metal foil. The enhancement is driven by the strong electrostatic field present close to the metal surface .


Archive | 1993

Ceramic catalytic membrane reactor for the separation of hydrogen and/or isotopes thereof from fluid feeds

Vittorio Violante; Livio Bettinali; Luigi Bimbi; Enrico Drioli


Journal of Alloys and Compounds | 2003

Stress-induced diffusion of hydrogen in metallic membranes: Cylindrical vs. planar formulation. II

Alessandra Adrover; Massimiliano Giona; Luigi Capobianco; P. Tripodi; Vittorio Violante


International Journal of Hydrogen Energy | 2006

Theoretical analysis of a pure hydrogen production separation plant for fuel cells dynamical applications

Luigi Capobianco; Z. Del Prete; P. Schiavetti; Vittorio Violante


Journal of Radioanalytical and Nuclear Chemistry | 2011

Neutron activation analysis for investigating purity grade of copper, nickel and palladium thin films used in cold fusion experiments

Pasquale Avino; E. Santoro; F. Sarto; Vittorio Violante; Alberto Rosada


Asia-Pacific Journal of Chemical Engineering | 2009

Water gas shift reaction via Pd-based membranes

Silvano Tosti; Fabio Borgognoni; Claudio Rizzello; Vittorio Violante

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M. Bertolotti

Sapienza University of Rome

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Luigi Capobianco

Sapienza University of Rome

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Alessandra Adrover

Sapienza University of Rome

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C. Sibilia

Sapienza University of Rome

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