Alumina gels are synthesized by different methods. Those
methods include the drying of xerogels by
simple evaporation either in water or in an another solvent, the
supercritical drying either in alcohol at
260 °C or in CO2, after hydrolysis in an organic solvent
in order to make aerogels, and the supercritical
drying either in methanol or in CO2, after hydrolysis in
excess water followed by exchange of the initial
water for another organic solvent. These three different synthesis
procedures result in different pore
textures, from micropores to mesopores, which had different resistance
to elimination by sintering during
heat treatment up to 1200 °C. Xerogels with micropores in a
planar texture configuration keep the smallest
residual specific area at 1200 °C, while aerogels hydrolyzed in an
organic solvent with a random network
of mesopores keep a higher residual specific surface area at the same
temperature.
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