Gao Yanan, Voigt Andreas, Hilfert Liane, Sundmacher Kai
Max Planck Institute for Dynamics of Complex Technical Systems, Sandtorstrasse 1, 39106 Magdeburg, Germany.
Chemphyschem. 2008 Aug 4;9(11):1603-9. doi: 10.1002/cphc.200800157.
A common ionic liquid (IL), 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF(4)), is used as polar solvent to induce the formation of a reverse bmimBF(4)-in-toluene IL microemulsion with the aid of the nonionic surfactant Triton X-100. The swelling process of the microemulsion droplets by increasing bmimBF(4) content is detected by dynamic light scattering (DLS), conductivity, UV/Vis spectroscopy, and freeze-fracture transmission electron microscopy (FF-TEM). The results show that the microemulsion droplets initially formed are enlarged by the addition of bmimBF(4). However, successive addition of bmimBF(4) lead to the appearance of large-sized microemulsion droplet clusters (200-400 nm). NMR spectroscopic analysis reveal that the special structures and properties of bmimBF(4) and Triton X-100 together with the polar nature of toluene contribute to the formation of such self-assemblies. These unique self-assembled structures of IL-based microemulsion droplet clusters may have some unusual and unique properties with a number of interesting possibilities for potential applications.
一种常见的离子液体（IL），1-丁基-3-甲基咪唑四氟硼酸盐（bmimBF₄），被用作极性溶剂，借助非离子表面活性剂吐温X-100诱导形成甲苯中的反相bmimBF₄微乳液。通过动态光散射（DLS）、电导率、紫外/可见光谱和冷冻断裂透射电子显微镜（FF-TEM）检测微乳液滴因bmimBF₄含量增加而发生的膨胀过程。结果表明，最初形成的微乳液滴会因添加bmimBF₄而增大。然而，连续添加bmimBF₄会导致出现大尺寸的微乳液滴簇（200 - 400纳米）。核磁共振光谱分析表明，bmimBF₄和吐温X-100的特殊结构和性质以及甲苯的极性共同促成了这种自组装的形成。基于离子液体的微乳液滴簇的这些独特自组装结构可能具有一些不寻常和独特的性质，在潜在应用方面有许多有趣的可能性。
