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We report an investigation of the effect of Aerosol OT on the surface charge of silica particles suspended in decane. The electrophoretic mobilities were measured using phase analysis light scattering, and supporting evidence was provided by conductivity and adsorption isotherm measurements. The results showed that, as the Aerosol OT concentration was increased, a sign reversal of the electrophoretic mobility occurred. This observation is explained qualitatively by a site-binding model of the charging mechanism.
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Keir et al. (2002) studied this question.
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