Super Thermal Insulating SiO2 Cryogels Prepared by Vacuum Freeze Drying

Abstract:

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Traditionally, silica aerogels with low thermal conductivity are prepared by supercritical drying, however, the process is expensive and hazardous due to it run in autoclaves. In order to overcome these disadvantages, a cheaper and safer process, drying at ambient pressure has been developed for decades, but tedious repetitive gel washing and solvent exchange steps are involved. Therefore, in the present study, a novel vacuum freeze-drying was utilized to prepare the super thermal insulating SiO2 cryogels. The wet gels were synthesized via acid-base catalysis using tetraethoxysilane (TEOS) as a silica precursor and ethanol as a solvent. After vacuum freeze drying, nanoporous SiO2 cryogels with low density in the range of 0.08-0.15 g/cm3 were obtained.

Info:

Periodical:

Advanced Materials Research (Volumes 105-106)

Edited by:

Wei Pan and Jianghong Gong

Pages:

851-854

DOI:

10.4028/www.scientific.net/AMR.105-106.851

Citation:

L. F. Su et al., "Super Thermal Insulating SiO2 Cryogels Prepared by Vacuum Freeze Drying", Advanced Materials Research, Vols. 105-106, pp. 851-854, 2010

Online since:

April 2010

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Price:

$35.00

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