Investigation of the Structuring in the SolGel Systems
Based on Tetraethoxysilane

T. V. Khamova, O. A. Shilova, and E. V. Golikova

Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences,
ul. Odoevskogo 24/2, St. Petersburg, 199155 Russia

Received September 28, 2005

Abstract—The kinetics of change in the dynamic and structural viscosity of a number of silica sols based on
tetraethoxysilane, including sols doped with aluminum and cobalt nitrates, is investigated. The results obtained
are analyzed in the framework of the Derjaguin–Landau–Verwey–Overbeek theory. It is revealed that structural
forces make a considerable contribution to the stability and structuring processes in these systems. The struc-
turing in a rapidly gelating homogeneous heterophase dispersion formed by finely dispersed -Al₂O₃ particles
in the silica sol doped with aluminum and cobalt nitrates is examined, and the assumptions regarding the mech-
anism of the structuring processes occurring in this system are made.

DOI: 10.1134/S1087659606040092

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