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Abstract: A Ginzburg-Landau theory is presented on surfactants in polar binarymixtures, which aggregate at an interface due to the amphiphilic interaction.They can be ionic surfactants coexisting with counterions. Including thesolvation and image interactions and accounting for a finite volume fraction ofthe surfactant, we obtain their distributions and the electric potential aroundan interface in equilibrium. The surface tension is also calculated. Thedistribution of the adsorbed ionic surfactant is narrower than that of thecounterions. The adsorption is marked for hydrophilic and hydrophobic pairs ofionic surfactant and counterions.



Author: Akira Onuki

Source: https://arxiv.org/







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