Reverse micelle and microemulsion phases in supercritical fluids
Reverse micelle and microemulsion phases in supercritical fluids
复制标题
DOI：
10.1021/j100321a039
复制
发表时间：
1988-05
期刊：
影响因子：
--
通讯作者：
J. Fulton;Richard D. Smith
中科院分区：
文献类型：
--
作者：
J. Fulton;Richard D. Smith
用表面活性剂二(2-乙基己基)琥珀酸磺酸钠(AOT)在超临界乙烷和丙烷中形成反胶束和微乳液相，用于烷烃质量分数为80-100%的体系。对超临界流体中形成的微乳液相进行了视胞研究，得到的相图与压力有很强的相关性。这些溶液的性质也通过电导率、密度和表面活性剂的溶解度测量来表征。AOT在一定压力范围内在乙烷和丙烷中的溶解度表现出固体在超临界流体中的典型行为。在乙烷和丙烷体系中，随着压力的增加，最大水/表面活性剂比(W/SUB_0/)都急剧增加。在300bar和103/sup 0/C下，超临界丙烷-表面活性剂体系比超临界乙烷-表面活性剂体系(W/sub0/=4)在300bar和37/sup 0/C时能够增溶更多的水(W/sub0/=4)。本文讨论了可能导致这种压力相关相行为的一些重要的热力学贡献，并考虑了这类新溶剂的潜在应用。
The surfactant sodium bis(2-ethylhexyl) sulfosuccinate (AOT) was used to form reverse micelle and microemulsion phases in supercritical ethane and propane for systems consisting of 80-100% alkane by weight. Phase diagrams obtained from view cell studies of microemulsion phases formed in supercritical fluids are reported and shown to be strongly dependent on pressure. The properties of these solutions were also characterized by conductivity, density, and surfactant solubility measurements. The solubility of AOT in ethane and propane over a range of pressures shows behavior typical of solids in supercritical fluids. The maximum water-to-surfactant ratio (W/sub 0/) increased dramatically in both ethane and propane systems as pressure was increased. At 300 bar and 103/sup 0/C, the supercritical propane-surfactant system is capable of solubilizing much more water (W/sub 0/ = 12) than the supercritical ethane-surfactant system (W/sub 0/ = 4) at 300 bar and 37/sup 0/C. Some of the important thermodynamic contributions that are likely responsible for this pressure-dependent phase behavior are discussed, and potential applications of this new class of solvents are considered.