Surfactant-mixing effects on the interfacial tension and the microemulsion formation in water/supercritical CO2 system.
Surfactant-mixing effects on the interfacial tension and the microemulsion formation in water/supercritical CO2 system.
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DOI：
10.1021/la062789i
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发表时间：
2007-01
期刊：
影响因子：
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通讯作者：
Masanobu Sagisaka;Tatsunori Fujii;Daisuke Koike;Satoshi Yoda;Y. Takebayashi;T. Furuya;A. Yoshizawa;H. Sakai;M. Abe;K. Otake
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文献类型：
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作者：
Masanobu Sagisaka;Tatsunori Fujii;Daisuke Koike;Satoshi Yoda;Y. Takebayashi;T. Furuya;A. Yoshizawa;H. Sakai;M. Abe;K. Otake
针对空气/水和水/超临界CO2 (scCO2) 界面系统以及水/scCO2 微乳液，研究了表面活性剂混合对界面张力和微乳液形成的影响。将氟化表面活性剂双(1H,1H,2H,2H-十七氟癸基)-2-磺基琥珀酸钠 (8FS(EO)2) 与三种烃表面活性剂 Pluronic L31、Tergitol TMN-6 和癸基三甲基氯化铵 (DeTAC) 以等摩尔比混合。对于所有情况，混合都显着降低了界面张力。积极的协同效应表明，混合表面活性剂往往比纯成分更紧密地堆积在界面上。然而，我们发现，除了 TMN-6 的情况外，混合从未促进 scCO2 中微乳液的形成。这可能是由于表面活性剂在微乳液表面分离成富烃相和富碳氟化合物相。
The effects of surfactant mixing on interfacial tension and on microemulsion formation were examined for systems of air/water and water/supercritical CO2 (scCO2) interfaces and for water/scCO2 microemulsions. A fluorinated surfactant, sodium bis(1H,1H,2H,2H-heptadecafluorodecyl)-2-sulfosuccinate (8FS(EO)2), was mixed with the three hydrocarbon surfactants, Pluronic L31, Tergitol TMN-6, and decyltrimethylammonium chloride (DeTAC), at equimolar ratio. For all the cases, the interfacial tension was significantly lowered by the mixing. The positive synergistic effect suggests that the mixed surfactants tend to pack more closely on the interface than the pure constituents. It was found, however, that the microemulsion formation in scCO2 was never facilitated by the mixing, except for the case of TMN-6. This is probably due to the segregation of the surfactants into hydrocarbon-rich and fluorocarbon-rich phases on the microemulsion surface.