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Partially Hydrolized Alkoxysilanes as Precursors for Silica Aerogels

机译：部分水解的烷氧基硅烷作为二氧化硅气凝胶的前体

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The classical sol-gel process for synthesizing SiO sub 2 aerogels involves the hydrolysis condensation of tetraethyoxysilane (TEOS) and or teramethyoxysilane (TMOS) to produce a gel which can then be supercritically extracted to a low density, highly porous aerogel glass. Controlled hydrolysis of TEOS and TMOS leads to partially hydrolyzed compounds that can be subsequently water processed to form silica aerogels in the density range from .020 to .500 g/cc. The partially hydrolyzed compounds are stable when sealed from moist air and can be stored for future use. We discuss the controlled conditions used to obtain these compounds and present data that characterize their structure. We detail the procedures for preparing the wide range of aerogel densities. We also report on their use as an adhesive. 4 refs., 5 figs. (ERA citation 13:034422)

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