Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
Chemphyschem. 2010 Apr 6;11(5):1044-52. doi: 10.1002/cphc.200900982.
The behavior of an ionic liquid (IL) within aqueous micellar solutions is governed by its unique property to act as both an electrolyte and a cosolvent. The influence of the surfactant structure on the properties of aqueous micellar solutions of zwitterionic SB-12, nonionic Brij-35 and TX-100, and anionic sodium dodecyl sulfate (SDS) in the presence of the "hydrophobic" IL 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF(6)]) is assessed along with the possibility of forming oil-in-water microemulsions in which the IL acts as the "oil" phase. The solubility of [bmim][PF(6)] within aqueous micellar solutions increases with increasing surfactant concentration. In contrast to anionic SDS, the zwitterionic and nonionic surfactant solutions solubilize more [bmim][PF(6)] at higher concentrations and the average aggregate size remains almost unchanged. The formation of IL-in-water microemulsions when the concentration of [bmim][PF(6)] is above its aqueous solubility is suggested for nonionic Brij-35 and TX-100 aqueous surfactant solutions.
离子液体（IL）在水胶束溶液中的行为受其独特的性质支配，即既能作为电解质又能作为共溶剂。本文评估了表面活性剂结构对两性离子 SB-12、非离子 Brij-35 和 TX-100 以及阴离子十二烷基硫酸钠（SDS）在“疏水”离子液体 1-丁基-3-甲基咪唑六氟磷酸盐([bmim][PF(6)])存在下的水胶束溶液性质的影响，以及 IL 充当“油”相形成油包水微乳液的可能性。[bmim][PF(6)]在水胶束溶液中的溶解度随表面活性剂浓度的增加而增加。与阴离子 SDS 相反，两性离子和非离子表面活性剂溶液在较高浓度下溶解更多的[bmim][PF(6)]，且平均聚集尺寸几乎保持不变。当[bmim][PF(6)]的浓度高于其在水中的溶解度时，建议在非离子 Brij-35 和 TX-100 水溶液中形成 IL-水微乳液。
