微乳液的热力学性质 I: 芳烃类的侧链链长对微乳液热力学函数影响

本文研究以非离子型表面活性剂-正辛醇-水-芳烃类所组成的微乳液, 探讨醇从油相转移到界面相时的自由能变化, 以及温度对自由能的影响。计算出熵和焓的变化, 发现在实验范围内, 上述热力学函数的对数值与芳烃侧链的碳原子数(n)呈线性关系。这些关系式对微乳液的构成和稳定性的讨论是重要的, 还对几种芳烃异构体所构成的微乳液的热力学函数进行了实验和讨论。

Thermodynamics of microemulsion I: The effect of alkyl chain length of alkyl aromatics

The free energy of transfer from the continuous oil phase to the interfacial region for 1-octanol in nonionic surfactant (Triton X 100)-water-oil(alkylarom.)-1-octanol microemulsions was reported. The effect of temperature on the change in free energy, entropy, and enthalpy value was studied. Logarithms of the free energy, entropy, and enthalpy values changed as a linear function of the no. of C atoms in the alkylaroms. The data were analyzed with respect to the microemulsion structure and stability.