Electrooptical Behavior of Aqueous (Hydroxypropyl)cellulose Liquid Crystals Containing Imidazolium Salts
Electrooptical Behavior of Aqueous (Hydroxypropyl)cellulose Liquid Crystals Containing Imidazolium Salts
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含咪唑鎓盐的水性（羟丙基）纤维素液晶的电光行为
DOI：
10.1021/bm201757d
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发表时间：
2012
影响因子：
6.2
通讯作者：
and Y. Nishio
中科院分区：
文献类型：
--
作者：
M. Ito;Y. Teramoto;and Y. Nishio
在弱电场作用下，通过加入一种波动离子型添加剂如PandTcshifter（P，α-pitch;Tc，浊点），可动态控制羟丙基纤维素（HPC）溶致物的结晶着色和光学透明度。本文展示了含有各种N-烷基取代甲基咪唑盐（[CnMim][X]）的HPC液晶的反射颜色和透明度随时间变化的渐变的一些例子;当每个各向异性溶液以层的形式密封在由一对碳电极隔开的平行载玻片之间，然后用直流电路通电时，可以感知到这一点。电光现象被解释为主要是由于产生的不成比例的位错的阳离子（CnMim+）/阴离子（X-）成分。即使在电力供应停止后，颜色渐变的样品中仍然存在明显的电位差。有人建议，含盐液晶系统的行为类似于一个准电容器作为粘性电解质的高电阻。
A dynamic control of the cholesteric coloration and optical clarity of aqueous (hydroxypropyl)cellulose (HPC) lyotropics is attainable under a weak electric field by employing a fluctuating ionic additive asPandTcshifter (P, cholesteric pitch;Tc, cloud point). The present Article demonstrates some examples of time-evolving gradation in reflection color and transparency for HPC liquid crystals containing variousN-alkyl-substituted methylimidazolium salts ([CnMim][X]); this was perceivable when each anisotropic solution was sealed in a layer form between parallel slide glasses spaced by a pair of carbon electrodes and then electrified with a direct circuit. The electrooptical phenomenon was interpreted as being primarily due to generation of a disproportional dislocation of cation (CnMim+)/anion (X–) constituents. Even after the electric supply was ceased, an appreciable potential difference remained in the color-gradated samples. It is suggested that the salt-containing liquid-crystalline system behaves like a quasi-capacitor as a viscous electrolytic medium of high resistance.