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Micellization of dodecyldimethylethyl- ammonium bromide in aqueous solution

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Abstract

Specific conductivity of aqueous solutions of dodecyldimethylethylammonium bromide has been determined in the temperature range of 15-40°C. The critical micelle concentration (cmc) and ionization degree of the micelles, b, were determined from the data. Thermodynamic functions, such as standard Gibbs free energy, ΔG m°, enthalpy, ΔG m°, and entropy, ΔG m°, of micellization, were estimated by assuming that the system conforms to the mass action model. The change in heat capacity upon micellization, ΔG m°, was estimated from the temperature dependence of ΔG m°. An enthalpy-entropy compensation phenomenom for the studied system has been found.

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Authors and Affiliations

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

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

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  1. J. J. Galán
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  2. A. González-Pérez
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  3. J. R. Rodríguez
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Galán, J.J., González-Pérez, A. & Rodríguez, J.R. Micellization of dodecyldimethylethyl- ammonium bromide in aqueous solution. Journal of Thermal Analysis and Calorimetry 72, 465–470 (2003). https://doi.org/10.1023/A:1024552911066

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