Direct formation of aerogels by sol-gel polymerizations of alkoxysilanes in supercritical carbon dioxide
Conference
·
OSTI ID:559944
- Sandia National Labs., Albuquerque, NM (United States)
Sol-gel polymerization of alkoxysilanes in supercritical carbon dioxide (SCCD) was used to directly prepare aerogels. Polymerizations of tetramethoxysilane (TMOS) and 1,4-bis(triethoxysilyl)benzene (BESP) were performed by dissolving the monomers and formic acid in supercritical carbon dioxide (SCCD). Monolithic gels were obtained in under 12 hours. The silica and polysilsesquioxane gels were readily dried to afford aerogels by slowly venting the SCCD. The aerogels were high surface area mesoporous materials that were characterized by solid state NMR, SEM, TEM, and gas sorption porosimetry.
- OSTI ID:
- 559944
- Report Number(s):
- CONF-970443--
- Country of Publication:
- United States
- Language:
- English
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