Synthesis and Colloidochemical Properties
of Yttrium Oxohydroxyde Hydrosols

I. A. Belova, K. I. Kienskaya, A. S. Grodskii, and V. V. Nazarov

Mendeleev University of Chemical Technology, Miusskaya pl. 9, Moscow, 125047 Russia

Received October 9, 2007

Abstaract—It is shown that hydrosols of oxygen-containing compounds of yttrium may be prepared by the
peptization and condensation methods. Basic characteristics of hydrosols, such as the size and shape of parti-
cles, their phase compositions, electrophoretic mobility, and the pH range of the dispersion medium where sols
are stable with respect to aggregation, are determined. Coagulation thresholds of the sols are estimated in the
presence of sodium nitrate and sulfate. It is found that the hydrosols coagulate reversibly. Concentration and
aging of the sols give rise to the spontaneous formation of slightly structured thixotropic gels. The nature of the
aggregation stability of hydrosols is suggested.

DOI: 10.1134/S1061933X08050049

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