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Effect of counterion on thermodynamic micellar properties of tetradecylpyridinium in aqueous solutions

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Abstract

Electrical conductivity of aqueous solutions of tetradecylpyridinium bromide and chloride has been measured as a function of surfactant molal concentration and temperature. From the molal dependence of conductivity, the critical micelle concentration and the micellar ionization degree were estimated. The temperature dependence of these parameters has been used for calculating the thermodynamic parameters related with the micellization process by using the classical charged pseudophase separation model. The effect of the counterion on the conventional thermodynamic potentials of micellization such as standard Gibbs free energy, enthalpy and entropy has also been a matter of study. Finally, the occurrence of the enthalpy–entropy compensation phenomenon was verified and the relevant parameters discussed.

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Acknowledgements

This work was supported by the Xunta de Galicia (Project PGIDIT03PXIB20601PR).

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Authors and Affiliations

  1. Grupo de Materia Condensada Blanda, Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Santiago de Compostela, Campus Sur s/n, 15782, Santiago de Compostela, Spain

    J. J. Galán, A. González-Pérez & J. R. Rodríguez

  2. Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Santiago de Compostela, Aptdo. 280, 27080, Lugo, Spain

    J. A. Seijas

  3. Facultad de Farmacia, Universidad de Santiago de Compostela, Campus Sur s/n, 15782, Santiago de Compostela, Spain

    E. Uriarte

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  1. J. J. Galán
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  2. A. González-Pérez
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  3. J. A. Seijas
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  4. E. Uriarte
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  5. J. R. Rodríguez
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Correspondence to J. R. Rodríguez.

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Galán, J.J., González-Pérez, A., Seijas, J.A. et al. Effect of counterion on thermodynamic micellar properties of tetradecylpyridinium in aqueous solutions. Colloid Polym Sci 283, 456–460 (2005). https://doi.org/10.1007/s00396-004-1206-0

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  • DOI: https://doi.org/10.1007/s00396-004-1206-0

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