Synthesis and aggregation stability of europium oxohydroxide hydrosols

Europium oxohydroxide hydrosols that are resistant to aggregation have been obtained by the condensation method. The density of dispersed phase particles, phase composition and dispersity of the sols, electrokinetic potential of the particles, and its dependence on medium pH have been determined. The effect of dispersion medium pH on the mechanism and reversibility of particle aggregation has been studied. The nature of the aggregation stability of the synthesized europium oxohydroxide hydrosols has been discussed.     

The structure of particles of the dispersed phase in europium oxyhydroxide hydrosol

Russian Chemical Bulletin - Rheological studies revealed the formation of boundary layers of oriented water dipoles on the surface of particles of the dispersed phase in europium oxyhydroxide...     

Synthesis and colloidochemical properties of yttrium oxohydroxyde hydrosols

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 particles, 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. Original Russian Text ? I.A. Belova, K.I. Kienskaya, A.S. Grodskii, V.V. Nazarov, 2008, published in Kolloidnyi Zhurnal, 2008, Vol. 70, No. 5, pp. 601–606.