Mixed Micellization and Interactional Behavior of Anionic Surfactants in Aqueous Solutions
DOI:
https://doi.org/10.17721/fujcV14I1P180-192Keywords:
anionic surfactants, mixed micellization, quantitative and thermodynamic analysisAbstract
Mixed micellar systems have attracted considerable attention because of their unique solution properties and broad practical applications. This study investigates the micellization behavior of binary mixtures composed of two types of anionic surfactants: sodium undecylcarboxylate and sodium alkyl sulfates in aqueous media. The critical micelle concentrations of the mixed surfactant systems were determined by conductometric and tensiometric methods. The aggregation characteristics of the mixed anionic surfactant systems were calculated using Rubingh's model. To the best of our knowledge, these parameters have not previously been reported for this particular mixed micellar system. The excess free energy of micellization was evaluated and correlated with the surfactant interaction parameter in mixed micelles. The obtained results were analyzed in terms of synergistic interactions within the systems, and the influence of the chemical structure of the polar (charged) head group as well as the hydrocarbon chain length of the anionic surfactants on the self-assembly processes in mixed systems was discussed.
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