反离子对离子液体氯化1-(2-羟乙基)-3-十二烷基咪唑在水溶液中自组装的影响  

Effect of Counter Ions on Self-assembly of Ionic Liquid 1-(2-Hydroxyethyl)-3-dodecylimidazolium Chloride in Aqueous Solutions

作　　者：刘雪锋[1] 陈晖[1] 田菲菲[1] 方云[1] 

机构地区：[1]江南大学化学与材料工程学院食品胶体与生物技术教育部重点实验室,无锡214122

出　　处：《应用化学》2013年第4期431-435,共5页Chinese Journal of Applied Chemistry

基　　金：江苏省高校"青蓝工程"优秀青年骨干教师基金资助项目(201027)

摘　　要：用表面张力法和荧光探针技术分别测定了阳离子型离子液体表面活性剂氯化1-(2-羟乙基)-3-十二烷基咪唑([C2OHC12im]Cl)在无机盐(NaX,X=Cl-,Br-,I-和Na2SO4)水溶液中的自组装参数。结果表明,反离子通过结合[C2OHC12im]+并中和其表面电荷,使[C2OHC12im]+的临界胶束浓度(CMC)和胶束平均聚集数(Nm)等自组装参数明显改变;改变幅度按照Cl-<Br-<I-<SO24-次序递增;但是反离子(Cl-、Br-和SO24-)种类对临界胶束平均聚集数(Nm,c)和胶束微极性([I1/I3]m)的影响不甚明显;随着Br-浓度增加,lg CMC线性减小,而Nm则以幂函数形式递增。The self-assembly of surface active ionic liquid 1-（2-hydroxyethyl）-3-dodecylimidazolium chloride（[C2OHC12im]Cl） in aqueous solutions with various inorganic salts（NaX,X=Cl-,Br-and I-,Na2SO4） has been investigated by surface tension method and fluorescence probe method,respectively.The critical micelle concentration（CMC） and average aggregation number（Nm） of [C2OHC12im]Cl changed remarkably in aqueous medium with the presence of counter ions.It is believed that the [C2OHC12im]＋ monomers or micelles are combined with the counter ions to neutralize their surface charges.The order of the counter ions in altering the self-assembly parameters of [C2OHC12im]Cl in aqueous medium follows Cl-Br-I-SO2-4.However,the effects of the category of counter ions on the critical aggregation number（Nm,C） and the micropolarity of micelle（m） were marginal.Along with the increase of the concentration of Br-,the CMC decreases logarithmically and the Nm increases by an empirical power law.

关 键 词：表面活性离子液体 氯化(羟乙基)十二烷基咪唑 无机反离子 自组装 

分 类 号：O647.2[理学—物理化学]