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首页> 外文期刊>Journal of thermal analysis and calorimetry >Thermodynamic study of the process of micellization of long chain alkyl pyridinium salts in aqueous solution
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Thermodynamic study of the process of micellization of long chain alkyl pyridinium salts in aqueous solution

机译：水溶液中长链烷基吡啶鎓盐胶束化过程的热力学研究

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摘要

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 ΔG_m~0, enthalpy ΔH~m_0 and entropy ΔS_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 ΔC_p was estimated from the temperature dependence of ΔH_m~0. An enthalpy-entropy compensation phenomenon for the studied system has been found.
机译：在30-45°C的温度范围内，研究了十五烷基溴化物，十六烷基溴化吡啶鎓和十六烷基吡啶鎓氯化物在水溶液中的比电导率与摩尔浓度的关系。直接从实验数据确定临界胶束浓度（cmc）和胶束的电离度β。通过假设系统符合伪相分离模型，估算了胶束化的热参数，例如标准吉布斯自由能ΔG_m〜0，焓ΔH〜m_0和熵ΔS_m〜0。由ΔH_m〜0的温度依赖性推定胶束化时的热容量变化ΔC_p。已经发现所研究系统的焓-熵补偿现象。

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