Micellization of dodecyldimethylethyl- ammonium bromide in aqueous solution

被引：0
|
作者：
J. J. Galán
A. González-Pérez
J. R. Rodríguez
机构：
[1] Universidad de Santiago de Compostela,Grupo de Ciencia y Tecnología de Coloides, Departamento de Física de la Materia Condensada
[2] Facultad de Física,undefined
[3] Campus Sur s/n,undefined
来源：
Journal of Thermal Analysis and Calorimetry | 2003年 / 72卷
关键词：
heat capacity; enthalpy; critical micelle concentration; dodecyldimethylethylammonium bromide; temperature dependence; conductivity; entropy and standard Gibbs free energy;
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学科分类号：
摘要：
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, ΔGm°, enthalpy, ΔGm°, and entropy, ΔGm°, of micellization, were estimated by assuming that the system conforms to the mass action model. The change in heat capacity upon micellization, ΔGm°, was estimated from the temperature dependence of ΔGm°. An enthalpy-entropy compensation phenomenom for the studied system has been found.
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页码：465 / 470
页数：5
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