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Semiequilibrium dialysis (SED) measurements have been used to investigate the solubilization and binding of benzoate anion by micelles of the cationic surfactant hexadecylpyridinium chloride. The equilibrium results are correlated with an ion-binding model described previously, with an additional parameter introduced to account for the solubilization of benzoate at least partly within the micelles. The benzoate ions bind, as expected, as counterions to the positively charged micelles, and in addition, they appear to solubilize similarly to neutral phenols and aromatic carboxylic acids, with the polar group anchored in the head-group region of the micelles and the aromatic moiety extending into the hydrophobic micellar interior.

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