磁性离子液体与表面活性剂的相互作用

Interaction between Magnetic Ionic Liquids and Surfactants

采用电导法研究了2种季膦盐类磁性离子液体四丁基膦氯合氯化铁盐([P4444]FeCl4)和十四烷基三丁基膦氯合氯化铁盐([P44414]FeCl4)在水溶液与CTAB形成的胶团相互作用和在非水溶液环己烷中与AOT形成的微乳液中相互作用。研究发现:离子液体[P4444]FeCl4在水溶液和非水溶液中均不和表面活性剂发生作用;[P44414]FeCl4具有长碳链,但其在水溶液和非水溶液中表现出不同于表面活性剂的性质,在水溶液中不与CTAB发生作用,而在AOT/环己烷/水的微乳液体系中,[P44414]FeCl4与AOT在油水界面发生作用,有利于微乳液的形成。

In this paper, quaternary phosphnium salt based magnetic ionic liquids(MILs) with different carbon chain length of cation structures selected to be studied are tetra-n-butylphosphonium([P4444]FeCl4) and tri-n-butylteradecylphosphonium([P44414]FeCl4). Interaction with cetyltrimethyl ammonium bromide(CTAB) or sodium bis(2-ethylhexyl) sulfosuccinate(AOT) is studied in aqueous/nonaqueous solution, respectively. Micelles formed with CTAB in aqueous solution and microemulsion formed with AOT in cyclohexane were tested and analyzed by conductance method. The results show that [P4444]FeCl4 cannot interact with surfactants in both aqueous and nonaqueous solutions. However,[P44414]FeCl4with longer carbon chain, its properties are different from surfactants in aqueous and nonaqueous solutions. It didn’t interact with CTAB in aqueous solution. However, its properties in microemulsion system formed by AOT/cyclohexane/water weren’t as same as those in aqueous solution. To some extent, interaction between [P44414]FeCl4and AOT in oil-water interface would facilitate miniemulsion polymerization.