We report on findings that the particle surface charge is influenced by solids concentration in aqueous suspensions of BaTiO 3 . Three decades in solids concentration were analyzed by combining results from two different electrokinetic methods. Combined results demonstrate a systematic acidic shift in the isoelectric pH with decreasing solids concentration. The shift is attributed to the development of a Ba‐depleted, TiO 2 ‐rich surface layer. Using kinetic arguments, it is shown that the thickness of this layer will be proportional to the surface‐to‐volume ratio.
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Paik et al. (2000) studied this question.
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