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Phase behavior in mixtures of cationic and anionic surfactants in aqueous solutions

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Abstract

Phase behavior of cationic/anionic surfactant mixtures of the same chain length (n=10, 12 or 14) strongly depends on the molar ratio and actual concentration of the surfactants. Precipitation of catanionic surfactant and mixed micelles formation are observed over the concentration range investigated. Coacervate and liquid crystals are found to coexist in the transition region from crystalline catanionic surfactant to mixed micelles.

The addition of oppositely charged surfactant diminishes the surface charge density at the mixed micelle/solution interface and enhances the apparent degree of counterion dissociation from mixed micelles. Cationic surfactants have a greater tendency to be incorporated in mixed micelles than anionic ones.

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Authors and Affiliations

  1. Department of Physical Chemistry, “Ruder Bosković” Institute, Bijenička 54, 41000, Zagreb, Croatia

    N. Filipović-Vinceković, M. Bujan, Đ. Dragčević & N. Nekić

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  1. N. Filipović-Vinceković
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  2. M. Bujan
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  3. Đ. Dragčević
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  4. N. Nekić
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Filipović-Vinceković, N., Bujan, M., Dragčević, Đ. et al. Phase behavior in mixtures of cationic and anionic surfactants in aqueous solutions. Colloid Polym Sci 273, 182–188 (1995). https://doi.org/10.1007/BF00654016

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  • DOI: https://doi.org/10.1007/BF00654016

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