Process for the preparation of monolithic silica aerogels

Details Process for the preparation of monolithic silica aerogels Process for the preparation of monolithic silica aerogels

1996-07-03

1998-08-18

Straub, Gary P.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

C01B 3314

Patent

active

057955573

ABSTRACT:
A process for the preparation of a silica aerogel that includes subjecting a mixture that includes an organosilicon compound and ethyl acetoacetate to hydrolysis and polycondensation in an acidic medium to obtain a transparent gel. The organic solvent is substituted by liquid carbon dioxide and the carbon dioxide is evacuated under supercritical conditions of the carbon dioxide to obtain an aerogel.

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T.M. Tillotson et al., "Transparent Ultralow-Density Silica Aerogels Prepared by a Two Step Sol-Gel Process", Journal of Non-Crystalline Solids 145 Aug. (1992) 44-50 North-Holland Elsevier Science Publishers.
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