Abstract
Aluminum hydrous oxide colloidal dispersions consisting of spherical particles of narrow size distribution can be produced by hydrolysis of aluminum sec-butoxide in aqueous sulfate solutions followed by aging at elevated temperatures. Sols consisting of these uniform particles form only under conditions that are rigidly controlled with respect to concentration, pH, rate of heating, and aging temperature. The effects of the various parameters on the resulting modal particle size, size distribution, relative stability, and electrophoretic mobility of the sol particles is discussed in detail.
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