The interaction enthalpies, entropies and Gibbs energies between microemulsion droplets for {water/sodium bis(2-ethylhexyl)sulfosuccinate (AOT)/ n -decane}, {water/NaCl/AOT/ n -decane} and {water/CaCl 2 /AOT/ n -decane}, with the molar ratio ω of water to AOT being 26.3 and the concentration of salt in water being 0.02 mol·L –1 , have been investigated by measurements of liquid–liquid phase equilibrium and isothermal titration microcalorimetry. The interaction enthalpies determined from isothermal titration microcalorimetry and liquid–liquid equilibrium are consistent. The interaction was found to be enhanced as the ionic strength increases. From the data of liquid–liquid equilibriums collected in the critical region, the critical exponent β corresponding to the width of the coexistence curve was determined, which showed good agreement with the 3D-Ising value and supported the pseudo binary solution proposal for these multiple microemulsions. A thermodynamic approach based on the Carnahan–Starling–van der Waals type equation was improved and used to deduce the interaction properties between droplets in the microemulsions. Salt effects on the microemusion phase equilibria are also discussed.

中文翻译：

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盐对油包水微乳液液滴间相互作用的影响

{水/双(2-乙基己基)磺基琥珀酸钠(AOT)/正癸烷}、{水/NaCl/AOT/正癸烷}和{水/CaCl 2 /的微乳液液滴之间的相互作用焓、熵和吉布斯能AOT/正癸烷}，水与AOT的摩尔比ω为26.3，水中盐浓度为0.02 mol·L –1 ，通过液-液相平衡测量和等温滴定微量热法进行了研究。从等温滴定微量热法和液-液平衡确定的相互作用焓是一致的。发现相互作用随着离子强度的增加而增强。根据在临界区收集到的液-液平衡数据，确定了对应于共存曲线宽度的临界指数β，这与 3D-Ising 值显示出良好的一致性，并支持这些多重微乳液的伪二元溶液建议。基于 Carnahan-Starling-van der Waals 型方程的热力学方法得到改进，并用于推断微乳液中液滴之间的相互作用特性。还讨论了盐对微乳液相平衡的影响。