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Thermodynamic study of the process of micellization of long chain alkyl pyridinium salts in aqueous solution

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Abstract

The molality dependence of specific conductivity of pentadecyl bromide, cetylpyridinium bromide and cetylpiridinium chloride in aqueous solutions has been studied in the temperature range of 30–45 °C. The critical micelle concentration (cmc) and ionization degree of the micelles, β, were determined directly from the experimental data. Thermal parameters, such as standard Gibbs free energy \( \Updelta G_{m}^{0} , \) enthalpy \( \Updelta H_{m}^{0} \) and entropy \( \Updelta S_{m}^{0} , \) of micellization were estimated by assuming that the system conforms to the pseudo-phase separation model. The change in heat capacity on micellization \( \Updelta C_{p} , \) was estimated from the temperature dependence of \( \Updelta H_{m}^{0} . \) An enthalpy–entropy compensation phenomenon for the studied system has been found.

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Acknowledgements

The authors wish to express their thanks for the financial support of the Dirección Xeral de I + D+I of the Xunta de Galicia and the European Regional Development Fund (INCITE07PXI206076ES).

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Authors and Affiliations

  1. Department of Energía y Propulsión Marina, University of La Coruña, ETS Ingenieros de Caminos, Canales y Puertos, Campus de Elviña, 15071, La Coruña, Spain

    J. J. Galán

  2. Nanomaterials and Soft Matter Group, Department of Physics of Condensed Matter, Faculty of Physics, University of Santiago de Compostela, Campus Sur s/n, 15782, Santiago de Compostela, Spain

    J. R. Rodríguez

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  1. J. J. Galán
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Correspondence to J. J. Galán.

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Galán, J.J., Rodríguez, J.R. Thermodynamic study of the process of micellization of long chain alkyl pyridinium salts in aqueous solution. J Therm Anal Calorim 101, 359–364 (2010). https://doi.org/10.1007/s10973-009-0385-9

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  • DOI: https://doi.org/10.1007/s10973-009-0385-9

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