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 the hydroxyl ones has been discussed to account for the final size of xerogel crystallites.
Effect of vacuum and of strong adsorbed water films on micropore formation in aluminum hydroxide xerogel powders
BERUTO, DARIO;BOTTER, RODOLFO;CONVERTI, ATTILIO
2009-01-01
Abstract
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 the hydroxyl ones has been discussed to account for the final size of xerogel crystallites.
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