Influence of Solids Concentration on the Isoelectric Point of Aqueous Barium Titanate
U Paik, Vincent A. Hackley
We report on findings that the particle surface charge is influenced by solids concentration in aqueous suspensions of barium titanate. By combining results from two electrokinetic methods, three decades in solids concentration were analyzed. Combined results demonstrate a systematic acidic shift in the isoelectric pH with decreasing solids. The shift is attributed to the development of a Ti-rich surface layer. Using kinetic arguments, it is shown that the thickness of this layer at a given time is proportional to the surface-to-volume ratio.
Journal of the American Ceramic Society
barium titanate, ceramic processing, dissolution, isoelectric point