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.
出处
《应用化学》
CAS
CSCD
北大核心
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)
