Charge-Induced Long-Range Order in a Room-Temperature Ionic Liquid.
Charge-Induced Long-Range Order in a Room-Temperature Ionic Liquid.
复制标题
DOI：
10.1021/acs.langmuir.6b02639
复制
发表时间：
2016-09
期刊：
影响因子：
--
通讯作者：
Ke Ma;Romana Jarosova;G. Swain;G. Blanchard
中科院分区：
文献类型：
--
作者：
Ke Ma;Romana Jarosova;G. Swain;G. Blanchard
我们报告的直接证据电荷诱导的长程（约。100 μm）顺序在室温离子液体（IL）1-丁基-3-甲基咪唑四氟硼酸盐（BMIM（+）BF 4（-））中，负载在二氧化硅表面上。我们已经测量了旋转扩散动力学的阴离子，阳离子和中性发色团作为从二氧化硅表面的距离的函数。结果反映了由二氧化硅表面上存在的（负）电荷在IL中诱导的过量电荷密度梯度。在乙二醇中的相同的测量揭示了所有发色团的空间不变的重取向动力学。用Me 2SiCl 2封端二氧化硅载体导致IL中的空间不变的重取向动力学。我们理解这些数据的背景下，表现出的IL流动性和障碍介导的空间阻尼压电响应的IL。
We report direct evidence for charge-induced long-range (ca. 100 μm) order in the room-temperature ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM(+)BF4(-)), supported on a silica surface. We have measured the rotational diffusion dynamics of anionic, cationic, and neutral chromophores as a function of distance from a silica surface. The results reflect the excess charge density gradient induced in the IL by the (negative) charge present on the silica surface. Identical measurements in ethylene glycol reveal spatially invariant reorientation dynamics for all chromophores. Capping the silica support with Me2SiCl2 results in spatially invariant reorientation dynamics in the IL. We understand these data in the context of the IL exhibiting a spatially damped piezoelectric response mediated by IL fluidity and disorder.