Anionic Surfactants on Anionic Substrate: Monovalent Cation Binding

Finian Allen, Lucy Griffin, Richard Alloway, P Gutfreund, SY Lee, Christopher Truscott, R Welbourn, Mary Wood & Stuart Clarke
Neutron reflectometry has been used to study the adsorption of the anionic surfactant bis(2-ethylhexyl) sulfosuccinate cesium salt on the anionic surface of mica. Evidence of significant adsorption is reported. The adsorption is reversible and changes little with pH. This unexpected adsorption behavior of an anionic molecule on an anionic surface is discussed in terms of recent models for surfactant adsorption such as cation bridging, where adsorption has been reported with the divalent ion calcium but...

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