文献类型：期刊文献

中文题名：[C_(12)mim]Br/SDS/H_2O溶液的螺旋状液晶

英文题名：Spiral Liquid Crystal in Solution of [C_(12)mim]Br/SDS/H_2O

作者：赵娜[1];闵承志[1];徐首红[1];尚亚卓[1];刘洪来[1]

机构：[1]华东理工大学化学与分子工程学院,上海200237

年份：2013

卷号：39

期号：3

起止页码：245

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：国家自然科学基金(21173079);中央高校基本科研业务费专项资金资助项目

语种：中文

中文关键词：离子液体;表面活性剂;层状液晶;螺旋状液晶

外文关键词：ionic liquids; surfactant; lamellar liquid crystal; spiral liquid crystal

摘要：通过实验观察发现离子液体表面活性剂溴化1-十二烷基-3-甲基咪唑([C12mim]Br)与传统阴离子表面活性剂十二烷基硫酸钠(SDS)的混合水溶液在一定条件下能形成各向异性的层状液晶;降低温度导致层状液晶相转变成特殊的螺旋网络织构的液晶,圆二色光谱测定表明该螺旋织构的液晶具有手性。咪唑类离子液体是形成这种特殊螺旋织构液晶的主导因素。溶液中分子间相互作用,包括氢键网络、π-π相互作用、表面活性剂烷烃链间的疏溶剂作用以及带相反电荷的极性头基间强烈的静电力是液晶形成的重要驱动力;而低温下随着分子热运动的减弱,组分间的氢键和π-π相互作用形成并能稳定存在是形成螺旋网络织构液晶的基础。
The lamellar lyotropic liquid crystal was formed in [C12mim] Br/SDS mixed aqueous solutions under certain condition as observed in our experiments. As temperature decreased, lamellar liquid crystal phase translated to a new type of spiral liquid crystal, whose chirality was analyzed by circular dichroism （CD）. Imidazolium-based ionic liquid plays a leading role during this transition. Non- covalent bonding interactions between the molecules including hydrogen-bond network, n-n stacking interaction, the hydrophobic interaction among surfactants, and the strong electrostatic attractive interaction of opposite-charged polar head are the main driving force of the formation of liquid crystal. Because of the weakened molecular thermal motion, hydrogen-bond network and π-π stacking interaction formed and kept stable at low temperatures, which led to the formation of spiral liquid crystal.