Abstract
Interaction of the anionic dye with cationic surfactants gives a sharp new absorption band at surfactant concentrations below the cmc for surfactant homomicelles. The band is shown to result from a dye-dye stacking interaction rather than from a change in dye geometry. Variation of the surfactant: dye (S:D) ratio gives distinct absorption bands characteristic of three disperse states: (1) a band similar to that of free dye at S:D ratios near the equivalence point that is due to a microcrystalline suspension of the insoluble salt; (2) the dye aggregate band at larger S:D ratios characteristic of mixed micelles having a significant population of dye molecules occurring side-by-side with their molecular axes nearly parallel; and (3) a band similar to that of dye dissolved in an organic medium at surfactant concentrations near the cmc. The intermediate mixed micelles are unstable and slowly reogranize to the insoluble salt. The dye is weakly surface active. Dye-CTAB mixtures are more surface active than CTAB alone at surfactant concentration$ near the cmc. The results are discussed in terms of possible structures of the mixed micelles.
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© 1977 Plenum Press, New York
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Reeves, R.L., Harkaway, S.A. (1977). Mixed Micelles of Methyl Orange Dye and Cationic Surfactants. In: Mittal, K.L. (eds) Micellization, Solubilization, and Microemulsions. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-4157-4_19
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DOI: https://doi.org/10.1007/978-1-4613-4157-4_19
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