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Synthesis of silica aerogels: influence of the supercritical CO2 on the sol-gel process
Publikationstyp
Journal Article
Date Issued
2003-09-01
Author(s)
Volume
28
Issue
2
Start Page
175
End Page
184
Citation
Journal of Sol-Gel Science and Technology 28 (2): 175-184 (2003-09-01)
Publisher DOI
Scopus ID
Publisher
Springer Science + Business Media B.V.
The synthesis of silica aerogels was modified by addition of supercritical CO2 during the sol-gel process. It was shown, that CO2 acts as a catalyst and accelerates the gelation significantly. This effect was studied under a multitude of experimental conditions. The influence of the precursor concentration, temperature and the nature of the catalysts and solvent on the gel formation in presence of CO2 was studied. Several gels obtained by this method were dried and transparent silica aerogels were produced.
Subjects
Reaction enhancement
Silica aerogels
Sol-gel process
Supercritical CO 2
DDC Class
540: Chemie
More Funding Information
This work was supported by DFG (Project Ar236/10-1) and Alexander von Humboldt Society (Program “Co-operation with Asia”).