Production of aerogels

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Abstract

Critical point drying of gels with carbon dioxide is used in the preparation of highly porous silica monoliths. In this work, silica with a reproducible density of 0.2 g/cc is obtained. Shrinkage during drying is observed using a high pressure view cell. Shrinkage is found to occur primarily during depressurization. A process has been developed to permit drying in less than 12 hours.

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Paper presented at the Symposium on Supercritical Fluids, 1990 AlChE Spring National Meeting, March 18–22, 1990, Orlando, FL, USA.

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