Investigation of the Structuring in the Sol-Gel Systems Based on Tetraethoxysilane

摘要

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 structuring in a rapidly gelating homogeneous heterophase dispersion formed by,finely dispersed alpha-Al_2O_3 particles in the silica sol doped with aluminum and cobalt nitrates is examined,and the assumptions regarding the mechanism of the structuring processes occurring in this system are made.