Process of forming a hydrophobic aerogel

Details Process of forming a hydrophobic aerogel Process of forming a hydrophobic aerogel

1994-04-28

1996-03-05

Bos, Steven

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

C01B 3312

Patent

active

054965276

ABSTRACT:
A hydrophobic aerogel having excellent transparency is formed by the following process of the present invention. That is, a first gel having a SiO.sub.2 skeleton structure is prepared by hydrolysis and condensation of an alkoxysilane compound in the presence of a solvent. The solvent contained in the first gel is replaced at least partially with a medium to form a second gel. The second gel is reacted with a hydrophobic agent having hydrophobic groups as well as functional groups reactive with silanol groups under a supercritical condition of the medium to form a hydrophobic gel. The medium contained in the hydrophobic aerogel is removed by a supercritical drying method, so that the hydrophobic aerogel having improved transparency and an extremely fine porous structure is obtained.

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Tillotson et al., "Partially Hydrolyzed Alkoxysilanes As Precursors For Silica Aerogels," 121 Mat. Res. Symp. Proc. 685 (1988), no month.
Derwent Abstract of JP 4-198238 (Jul. 17, 1992).
Derwent Abstract of JP 5-279011 (Oct. 26, 1993).

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