Electrocapillarity at the nonpolarized interface between the aqueous solution and the room-temperature molten salt composed of 1-octyl-3-methylimidazolium bis(pentafluoroethylsulfonyl)imide
Electrocapillarity at the nonpolarized interface between the aqueous solution and the room-temperature molten salt composed of 1-octyl-3-methylimidazolium bis(pentafluoroethylsulfonyl)imide
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DOI：
10.1039/b408333b
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发表时间：
2004-09
影响因子：
3.3
通讯作者：
T. Kakiuchi;F. Shigematsu;Takuya Kasahara;Naoya Nishi;Masahiro Yamamoto
中科院分区：
文献类型：
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作者：
T. Kakiuchi;F. Shigematsu;Takuya Kasahara;Naoya Nishi;Masahiro Yamamoto
测量了由1-辛基-3-甲基咪唑鎓双(全氟乙基磺酰基)亚胺(C8mimC2C2N)组成的室温熔盐(RTMS，也称为离子液体)与含有1-辛基-3-甲基咪唑氯化物或锂双(全氟乙基磺酰基)亚胺锂的水溶液之间的界面张力与水相组成的函数关系。根据溶液成分计算出该非极化界面的相边界电势使我们能够构建相应的电毛细管曲线，该曲线相对于相边界电势超过 300 mV 的变化呈现抛物线形状。 C8mim+离子特异性吸附在界面处。电势决定离子从 C8mim+ 切换到 C2C2N− 会导致界面水侧外亥姆霍兹平面处的电势跃升超过 160 mV。
The interfacial tension between the room-temperature molten salt (RTMS, also called ionic liquid) composed of 1-octyl-3-methylimidazolium bis(perfluoroethylsulfonyl)imide (C8mimC2C2N) and the aqueous solution containing 1-octyl-3-methylimidazolium chloride or lithium bis(perfluoroethylsulfonyl)imide has been measured as a function of the composition of the aqueous phase. The phase–boundary potential calculated for this non-polarized interface from the solution composition enables us to construct the corresponding electrocapillary curve, which shows a parabolic shape with respect to the variation of the phase–boundary potential over 300 mV. C8mim+ ions specifically adsorb at the interface. Switching of the potential-determining ion from C8mim+ to C2C2N− causes a jump of more than 160 mV in the potential at the outer Helmholtz plane on the aqueous side of the interface.