Charging Behavior in the Silica/Aerosol OT/Decane System

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 res...

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Bibliographic Details
Published in:Langmuir 2002-03, Vol.18 (5), p.1463-1465
Main Authors: Keir, Roland I, Suparno, Thomas, John C
Format: Article
Language:English
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Summary: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.
ISSN:0743-7463
1520-5827
DOI:10.1021/la0108757