We study the behavior of a model surfactant that mimics sodium dodecyl sulfate (SDS) near a hydrophobic surface. We focus on the surfactant adsorption over a wide range of surfactant concentrations. The obtained adsorption isotherm is consistent with the experimental results. We explore the mechanism of surfactant adsorption on the solid surface and the interplay between the adsorption of surfactants and their aggregation both on the substrate and in the bulk solution. The self-assembly of surfactant molecules is analyzed in detail. We found that adsorption of whole micelles (rather than single molecules) from the solution is the dominant mechanism for surfactant accumulation on surfaces.
Staszewski et al. (Tue,) studied this question.
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