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Effect of 1-Pentanol on the Thermodynamics of the Micellization of Hexadecyltrimethylammonium Bromide in Aqueous Solutions

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Abstract

The thermodynamic parameters (ΔH, ΔG, and ΔS) of the micellization of hexadecyltrimethylammonium bromide (CTAB) in aqueous solutions of 1-pentanol at 298.15 and 313.15 K are measured via micelle destruction. Critical micelle concentrations CMC 1 and CMC 2 at different concentrations of pentanol are determined. It is found that adding pentanol to a solution at 313.15 K does not affect the entropy of micelle formation, which is ΔS in pure water. A linear compensation relationship between the ΔH and ΔG values is revealed. It is shown that the entropy of a solution at 298.15 K falls upon adding pentanol, and the compensation relationship between the ΔH and ΔS values is in this case similar to the one obtained upon varying the temperature of a solution.

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ACKNOWLEDGMENTS

This work was supported by OOO TERMEKS (http://termexlab.ru/ru/).

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  1. Institute of Petroleum Chemistry, Siberian Branch, Russian Academy of Sciences, 634021, Tomsk, Russia

    A. A. Velikov

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  1. A. A. Velikov
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Correspondence to A. A. Velikov.

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Translated by O. Kadkin

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Velikov, A.A. Effect of 1-Pentanol on the Thermodynamics of the Micellization of Hexadecyltrimethylammonium Bromide in Aqueous Solutions. Russ. J. Phys. Chem. 92, 1857–1859 (2018). https://doi.org/10.1134/S0036024418090327

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