Abstract
Self-consistent field theory for adsorption and association is utilized to calculate the adsorption of an ionic surfactant (C16P3+) to two identical, negatively charged, slightly hydrophobic solids separated by a thin film and immersed in an infinite reservoir of aqueous 1:1 electrolyte. This theory explicitly accounts for short-ranged “chemical” forces as well as electrostatic and polarization forces. A change in the separation between the solids leads to a change in interaction energy, which leads to a change in both the amount and the organization of the adsorbed surfactant (proximal adsorption). When the separation between the solids is much greater than the thickness of the adsorbed layers, the general features of the proximal adsorption can be predicted from the adsorption at infinite separation; the adsorption depends on whether each surface is above or below the charge compensation point (ccp). At the ccp, the net charge of the solid plus the adsorbed surfactant is zero. There are few other ions a...
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