BERUTO , Dario

This paper illustrates a new thermodynamic and kinetic model that describes the relationship between the water self-diffusion coefficient, D* w/g; in hydrogel contact lenses, in terms of water matric potential ψM and equilibrium water content (EWC). Experimental measurements on commercial contact lenses yield water thermodynamic activity...

Sputtered oxidized molybdenum surfaces were exposed at room temperature for different times to paraffin vapors obtained at 150◦C. Scanning polarization force microscopy (SPFM), optical and confocal microscopy were used to characterize the surfaces. The condensed morphologies are complex and strongly dependent upon the quantity of vapor...

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Calcium and calcium magnesium putty-limes (C-L and C-M-L) were characterized, through SEM, Porosimeter and Chemical Analysis, to obtain information on the microstructure of their solid-phases. Irregular agglomerates of portlandite grains and large acicular crystallites of brucite are differently interconnected to form a cellular solid matrix...

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Natural dolomite powders obtained from caves which give unusual high resistance building materials, have been decomposed in a Knudsen cell at high CO2 pressures in the temperature range of 913-973 K. XRD traces for the final solid products, after the first half thermal decomposition, have shown, that beside the XRD patterns for the calcite and...

Aluminum hydroxide gels were washed with water, ethanol, methanol and isopropanol to obtain new gels with different liquid phases that were dried either in air at 120 ◦C or under vacuum at 80 ◦C. Drying in air leads to alcoholic xerogels with BET surface areas larger than the aqueous ones. The effect of the alcoholic groups as substitutes of...

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Aluminum hydroxide gelled media dispersed and then aged in alcohol (ES) or in water (WS) were prepared with a solid phase concentration equal to 0.45% v/v. A model for microstructural units dispersed in the liquid phase has been derived. The beneficial action of alcohol in giving xerogel powders with higher specific surface area and higher...

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The purpose of the paper is to propose a new numerical elastohydrodynamic analysis method suited to cinematic pairs lubricated with aqueous dispersions of collagen gelled media. In comparison with traditional lubricants, these media are characterized by an apparent viscosity that increases with film thickness. Hence the Reynolds equation has...

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Composites of a silicone matrix charged with graphite powder of micrometric size in volume fractions around the electric percolation threshold (25–35%) have been investigated with regard to their piezoresistance properties. The elastic modulus changes with graphite content, reaching a maximum at 30 vol.%. From measurements of electric...

Method to obtain a biocompatible polymer ceramic composite material of a predeterminated porosity

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Calcium-carbonate powders were coprecipitated with Al3+ and then decomposed in air and/or under a CO2 flux between 590 ◦C and 1150 ◦C. The data were analysed using a consecutive-decomposition-dilatometer method and the kinetic results were discussed according to the microstructure analysis done by N2 adsorption isotherms (78 K), SEM and FT-IR...