Abstract
In the present research the influence of drying technique on the structural properties of silica gels prepared by different routes was studied. The silica aquagels were obtained by hydrolysis of tetraethylorthosilicate Si(OEt)4 (TEOS) under base- or acid-catalyzed conditions or by the gelation of SiO2 sol prepared by the fast hydrolysis of Na2SiO3 aqueous solutions in the presence of HCl. The drying techniques employed were freeze-drying as compared to conventional thermal drying at 80°C. Properties of resulting xerogels and cryogels were studied by N2 adsorption at 77K, DTA and SEM. It was shown that the structural changes during both freeze-drying and conventional drying are strongly influenced by the structure of initial aquagel.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Yu.D. Tretyakov, N.N. Oleynikov, and O.A. Shlyahtin, Cryochemical Synthesis of Advanced Materials (Chapman & Hall, London, 1997), p. 323.
D. Segal, Chemical Synthesis of Advanced Ceramic Materials (Cambridge University Press, 1991).
D. Klvana, J. Chaouki, L. Perras, and C. Belanger, Powder catalyst for a new hydrogenation process for aromatic hydrocarbons, in Progress in Catalysis, edited by K.J. Smith and E.C. Sanford (Elsevier Science Publishers B.V., 1992).
S.V. Kalinin, Cryosol Synthesis on Nanocomposite Materials, M.Sc. Thesis, Moscow State University, 1998.
G.M. Pajonk, M. Repellin-Lacroix, S. Abournadasse, J. Chaouki, and D. Klvana, J. Non-Cryst. Solids 121, 66–67 (1990).
D. Klvana, J. Chaouki, M. Repellin-Lacroix, and G.M. Pajonk, Rev. Phys. Appl. 24 C4, 29–32 (1989).
D.W. Johnson, Jr., P.K. Gallagher, F.J. Schnettler, and E.M. Vogel, Ceramic Bulletin 56(9), 785 (1977).
J.C.P. Broekhoff and B.G. Linsen, Physical and Chemical Aspects of Adsorbents and Catalysts (Academic Press, London and New York, 1970).
A.B. Rabinovich, A.V. Neimark, and L.I. Heifets, New computer program for characterization of porous structure DIAPOR, Second International Symposium “Characterization of Porous Solid”-COPS-II, Alicante, Spain, 1990, Poster 31.
C.J. Brinker and G.W. Scherer, Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing (Academic Press, San Diego, 1990), p. 601.
D.W. Schaefer and K.D. Keefer, “Fractal aspects of ceramic synthesis,” in Better Ceramics Through Chemistry, edited by C.J. Brinker et al., Mat. Res. Soc. Symp. Proc. 73, 277–288 (1986).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kalinin, S., Kheifets, L., Mamchik, A. et al. Influence of the Drying Technique on the Structure of Silica Gels. Journal of Sol-Gel Science and Technology 15, 31–35 (1999). https://doi.org/10.1023/A:1008771829173
Issue Date:
DOI: https://doi.org/10.1023/A:1008771829173