Institute of Problems of Chemical Physics, Russian Academy of Sciences, Acad. Semenov Av. 1, Chernogolovka, Moscow Region 142432, Russia.
J Colloid Interface Sci. 2010 Nov 15;351(2):485-92. doi: 10.1016/j.jcis.2010.08.015. Epub 2010 Aug 10.
The polydispersity of the reverse micelles is determined mainly by the fluctuations of their composition. The composition of the reverse micelle is a two-dimensional random variable whose components are the numbers of water (i) and surfactant (j) molecules. In this study the fluctuations of the composition of the reverse micelles are considered in the Gaussian approximation. It is shown that the standard deviation of the quantity w=i/j may be calculated from the dependence of the water vapor pressure above the microemulsion on the molar ratio W=[water]/[surfactant]. The estimation based on the literature data for microemulsion system sodium bis(2-ethylhexyl)sulfosuccinate/water/isooctane at 37°C in the range W=0-18 has shown that the relative standard deviation of the quantity w is about 10%. It is shown that the value of the composition fluctuations is related to the dependence of average composition on the concentration of reverse micelles at constant parameter W.
反胶束的多分散性主要由其组成的波动决定。反胶束的组成是一个二维随机变量，其分量是水（i）和表面活性剂（j）分子的数量。在这项研究中，反胶束组成的波动在高斯近似下进行了考虑。结果表明，可以根据微乳液上方水蒸气压力与摩尔比 W=[水]/[表面活性剂]的关系，计算出量 w=i/j 的标准偏差。基于文献数据对 37°C 下微乳液体系（乙基己基磺酸钠/水/异辛烷）的估计表明，在 W=0-18 的范围内，量 w 的相对标准偏差约为 10%。结果表明，组成波动的值与平均组成对常数 W 下反胶束浓度的依赖性有关。
