Gao Yanan, Li Na, Zhang Shaohua, Zheng Liqiang, Li Xinwei, Dong Bin, Yu Li
Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education, Jinan 250100, China.
J Phys Chem B. 2009 Feb 5;113(5):1389-95. doi: 10.1021/jp808522b.
The role of four organic solvents in the formation process of 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF4) based ionic liquid (IL) microemulsions is investigated. The results showed that the addition of Triton X-100 remarkably decreased the conductivity of bmimBF4. The added organic solvents provided a strong apolar environment for the hydrophobic tails of Triton X-100 and caused the surfactant molecules to aggregate into the interfacial film of oil-in-bmimBF4 (O/IL) microemulsions. As a result, the conductivities of the solutions were initially increased because the insulative Triton X-100 molecules were assembled, which corresponded to increasing the concentration of continuous bmimBF4 solutions. The hydrophobic interaction between the dispersed organic solvents and the hydrophobic tails of Triton X-100 may be the driving force for the formation of O/IL microemulsions. The droplets of O/IL microemulsions were successively swollen by organic solvents, and a bicontinuous IL-containing microemulsion was observed by freeze-fracture transmission electron microscopy for the first time. The current study can help in further understanding the ILs-containing microemulsions and thereby improve microemulsion theory.
研究了四种有机溶剂在基于1-丁基-3-甲基咪唑四氟硼酸盐（bmimBF4）的离子液体（IL）微乳液形成过程中的作用。结果表明，添加 Triton X-100 显著降低了 bmimBF4 的电导率。添加的有机溶剂为 Triton X-100 的疏水尾部提供了强非极性环境，并导致表面活性剂分子聚集形成 bmimBF4 包油（O/IL）微乳液的界面膜。结果，溶液的电导率最初增加，因为绝缘的 Triton X-100 分子聚集，这相当于连续 bmimBF4 溶液浓度的增加。分散的有机溶剂与 Triton X-100 的疏水尾部之间的疏水相互作用可能是 O/IL 微乳液形成的驱动力。O/IL 微乳液的液滴被有机溶剂依次溶胀，首次通过冷冻断裂透射电子显微镜观察到双连续含离子液体微乳液。当前的研究有助于进一步理解含离子液体的微乳液，从而完善微乳液理论。
