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Preparation and structure of stable dispersions of uniform TiO2 nanoparticles

Pavlova-Verevkina O. B., Chvalun S. N., Shevchuk Y. A., Ozerina L. A., Ozerin A. N.

Materials Science Poland

2007

Vol. 25, No. 3

825--834

A set of narrow fractions of anatase TiO2 nanocrystals was isolated by the stepped coagulation of polydisperse hydrosols using strong acids as coagulators. The sols and gels prepared from the fractions were studied by LAXS, SAXS, turbidimetry, dynamic light scattering, and other methods. The shape of uniform titania nanocrystals in the fractions was determined to be plate-like; thickness of the platelets was 2-3 nm and their lateral sizes differed considerably in the fractions. A rapid partial coagulation and slow sol separation processes were observed after the addition of HCl and KCl to the sols. The rapid coagulation threshold was shown to depend essentially on nanoparticles size; the rate of the slow process depended strongly on the electrolyte concentration. Some stable concentrated dispersions of nanometer periodicity were formed from the narrow titania fractions.