Study of the slow electrolyte-induced changes in the TiO2 hydrosol structure
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Abstract
Slow changes in the TiO2 hydrosol structure induced by a small KCl additive were studied using the small-angle X-ray scattering. The initial sol of anisometric anatase nanocrystals stabilized by HCl was prepared. After addition of KCl scattering curves were measured regularly for 2 years. It was established the formation and the accumulation of small dense aggregates. A model of the slow structural changes in the TiO2 sols with electrolyte additives comprising the two steps of aggregation was proposed. At first the larger anatase nanocrystals combine slowly forming the small dense aggregates through the oriented attachment mechanism. Then, at the critical size of such aggregates, they coagulate quickly forming the looser particles.
Keywords
TiO2 Nanocrystals Hydrosol Electrolyte Slow aggregation Turbidity SAXSNotes
Acknowledgment
The work was supported by the Russian Foundation for Basic Research (Project No. 06-03-32237).
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