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Influence of Barium Dissolution on the Electrokinetic Properties of Colloidal BaTiO3 in an Aqueous Medium

Published

Author(s)

S K. Lee, Vincent A. Hackley, U Paik

Abstract

Hystersis in the electrokinetic behavior of hydrothermally synthesized colloidal BaTiO3 is observed during sequential acid and base titrations. Ba2+ dissolved during the acid titration results in a Ba-depleted oxide-rich surface. As the acid treated BaTiO3 suspension is back titrated to pH 10, dissolved Ba2+ is adsorbed and/or heterogeneously precipitated onto the particle surface. The combined effects of dissolution and subsequent adsorption-precipitation result in the observed hystersis of the measured dynamic mobility-pH curves. The changes in surface chemistry reflected in the hysteresis are expected to significantly impact dispersion stability. The electrokinetic behavior of BaTiO3 was measured also after repeated acid treatment, which resulted in TiO2-like surface chemistry and removal of essentially all available Ba from the surface layer. Based on our results, a qualitative model is offered to explain the electrokinetics of colloidal BaTiO3 as a function of pH, solids loading and particle size, and an argument is presented in opposition to BaCO3 contamination as the primary source of dissolved Ba in aqueous BaTiO3 suspensions.
Citation
Journal of the American Ceramic Society
Volume
86
Issue
No. 10

Keywords

aqueous tape casting, barium carbonate, barium titanate, dynamic mobility, electrokinetic potential, titanium oxide

Citation

Lee, S. , Hackley, V. and Paik, U. (2003), Influence of Barium Dissolution on the Electrokinetic Properties of Colloidal BaTiO<sub>3</sub> in an Aqueous Medium, Journal of the American Ceramic Society (Accessed April 19, 2024)
Created September 30, 2003, Updated October 12, 2021