Abstract
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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
J. Fricke (Ed.), Aerogels (Springer Verlag, Berlin, 1986).
P.H. Tewari and A.J. Hunt, U.S. Patent No. 4,610,863.
C.J. Brinker et al., J. Non-Cryst. Solids 48, 47 (1982).
T.M. Tillotson, J.F. Poco, L.W. Hrubesh, and I.M. Thomas, U.S. Patent No. 5,409,683.
V. Rao and N.N. Parvathy, J. Mat. Sci. 28, 3021 (1993).
G.M. Pajonk, J. Non-Cryst. Solids 225, 307 (1998).
Kun-Hong Lee, Sun-Youg Kim, and Ki-Pung Yoo, J. Non-Cryst. Solids 186, 307 (1995).
M. Stolarski, J. Walendziewski, M. Steininger, and B. Pnia, Appl. Cat. A 177, 139 (1999).
D.A. Loy, E.M. Russick, S.A. Yamanaka, and B.M. Baugher, Chem. Mater. 4, 749 (1997).
P.G. Bendale and R.M. Enick, Fluid Phase Equilibria 94, 227 (1994).
A. Kordikowski, A.P. Schenk, R.M. Van Nielen, and C.J. Peters, J. Supercritical Fluids 8, 205 (1995).
NIST Chemistry WebBook, in NIST Standard Reference Database Number 69, edited by P.J. Linstrom and W.G. Mallard, (National Institute of Standards and Technology, Gaithersburg, MD, July 2001) Also available at http://webbook.nist.gov.
C.J. Brinker and G.W. Scherer, Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing (Academic Press, San Diego, 1990).
R. Aelion, A. Loebel, and F. Eirich, JACS 72, 5705 (1950).
S. Yoda and S. Ohshima, J. Non-Cryst. Solids 248, 224 (1999).
N. Hüsing, Dissertation (Würzburg, 1997).
G. Orcel, J. Phalippou, and L.L. Hench, J. Non-Cryst. Solids 86, 114 (1986).
C.J. Brinker, K.D. Keefer, D.W. Schaefer, and C.S.-Achley, J. Non-Cryst. Solids 48, 47 (1982).
W.L. Huang, K.M. Liang, and S.R. Gu, J. Non-Cryst. Solids 258, 234 (1999).
T.M. Bernards, M.J. Janssen, and M.J. van Bommel et al., J. Non-Cryst. Solids 134, 1 (1991).
M. Moner-Girona, A. Roig, and E. Molins, J. Sol-Gel Sci. Techn. 26, 645 (2003).
I. Artaki, T. Zeda, and J. Jonas, J. Non-Cryst. Solids 81, 381 (1986).
R.A. Ferrieri, I. Garcia, J.S. Fowler, and A.P. Wolf, Nuc. Drug & Med. 26, 443 (1999).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Smirnova, I., Arlt, W. Synthesis of Silica Aerogels: Influence of the Supercritical CO2 on the Sol-Gel Process. Journal of Sol-Gel Science and Technology 28, 175–184 (2003). https://doi.org/10.1023/A:1026072914972
Issue Date:
DOI: https://doi.org/10.1023/A:1026072914972