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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 69  2010
Advances in Aerogels made by Sonocatalysis
L. Esquivias*, V. Morales-Flórez** and N. de la Rosa-Fox***
Pages: 125-130
DOI : 10.1080/0371750X.2010.11090828
Abstract
High power ultrasound applied to liquids produces cavities. When an alkoxide/water mixture is sonicated, the cavities, which attain very high temperatures and pressures, act as nanoreactors, where the hydrolysis reaction starts. When the resultant sonosol gels to produce a sonogel, it is denser, with finer and more homogeneous porosity than that of a classic counterpart. Thus, acoustic cavitation permits to obtain nanostructured materials. Sono-aerogels have a high surface/volume ratio and are built by small particles (~1 nm radius) and a high cross-linked network with low –OH surface coverage radicals. Structural models based on randomly-packed spheres in several hierarchical levels that represent the real sono-aerogel are shown. Finally, these materials find application, between others, for CO2 sequestration, since the small size of the pore permits hosting silicate nanocrystals that carbonate easily in the presence of CO2 in aqueous solution.
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