BOTTER , Rodolfo

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...

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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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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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Enthalpy of wetting of silica–paraffin dispersions is function of volume fraction θ. ► Microstructure of silica–paraffin dispersion evolves according to branching mechanism. ► Stability of a silica–paraffin microstructure is greater than kaolin–paraffin one. ► Percolation thresholds determined by analysing τ0 versus θ and ΔH versus θ are fairly equal.

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

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Different additives based on Na oleate, Na oleate – Ca stearate and Al stearate were used in two different quantities (0.15 %w/w and 0.30 %w/w of the solid amount) to enhance the waterproofing effect of mortars. From capillary water absorption test, Na oleate showed the better performance with a reduction of water absorbed of 86% in comparison...

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...

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In this paper we develop a consecutive decomposition–sintering dilatometer method (CDSD) to study the effect of limestone impurities on lime microstructure features that are formed during the limestone decomposition. Two experimental parameters, the changing in slope of the dilatometer trace (β) and the total shrinkage of the produced lime in...

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Processo di produzione di allumina mediante coprecipitazione in presenza di nano polveri di carburo di silicio