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Effects of alkyl chain length on properties of 1-alkyl-3-methylimidazolium fluorohydrogenate ionic liquid crystals

机译:烷基链长度对氟代1-烷基-3-甲基咪唑鎓离子液晶的性能的影响

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摘要

A series of 1-alkyl-3-methylimidazolium fluorohydrogenate salts (C _xMIm(FH)_2F, x=8, 10, 12, 14, 16, and 18) have been characterized by thermal analysis, polarized optical microscopy, IR spectroscopy, X-ray diffraction, and anisotropic ionic conductivity measurements. Liquid crystalline mesophases with a smectic A interdigitated bilayer structure are observed from C_(10) to C_(18), showing a fan-like or focal conic texture. The temperature range of the mesophase increases with the increase in the alkyl chain length (from 10.1°C for C_(10)MIm(FH)_2F to 123.1°C for C_(18)MIm(FH) _2F). The distance between the two layers in the smectic structure gradually increases with increasing alkyl chain length and decreases with increasing temperature. Conductivity parallel to the smectic layers is around 10mS-cm~(?1) regardless of the alkyl chain length, whereas that perpendicular to the smectic layers decreases with increasing alkyl chain length because of the thicker insulating sheet with the longer alkyl chain.
机译:通过热分析,偏光光学显微镜,IR光谱,X表征了一系列1-烷基-3-甲基咪唑鎓氟氢化盐(C _xMIm(FH)_2F,x = 8、10、12、14、16和18)。射线衍射和各向异性离子电导率测量。从C_(10)到C_(18)观察到具有近晶A叉指状双层结构的液晶中间相,显示出扇状或焦点圆锥形纹理。中间相的温度范围随着烷基链长的增加而增加(从C_(10)MIm(FH)_2F的10.1°C到C_(18)MIm(FH)_2F的123.1°C)。近晶结构中两层之间的距离随着烷基链长度的增加而逐渐增加,而随着温度的升高而减小。平行于近晶层的电导率约为10mS-cm〜(?1),与烷基链长无关,而垂直于近晶层的电导率随烷基链长的增加而降低,这是因为具有较长烷基链的绝缘片越厚。

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