金属盐作用下的表面活性剂临界胶束浓度的变化研究  

An Investigation on the Variation of Critical Micelle Concentrations of CTAB and SDS Surfactants Influenced by Salts

作　　者：杜娟[1] 曾宪诚[1] 

机构地区：[1]四川大学化学学院,成都610064

出　　处：《四川大学学报（自然科学版）》2002年第4期721-724,共4页Journal of Sichuan University(Natural Science Edition)

基　　金：国家自然科学基金 (2 98730 31)

摘　　要：用电导法系统地研究了金属离子———Cu(Ⅱ ) ,Zn(Ⅱ ) ,Co(Ⅱ ) ,Ni(Ⅱ ) ,La(Ⅲ )和Fe(Ⅲ )对两种离子型表面活性剂———十二烷基硫酸钠 (SDS)和十六烷基三甲基溴化铵 (CTAB)的临界胶束浓度 (CMC)的影响 ,并推导了一系列表达金属离子浓度和表面活性剂SDS及CTAB的临界胶束浓度 (CMC)之间关系的经验公式 .结果表明 ,SDS和CTAB的临界胶束浓度 (CMC)均随着金属离子浓度的增加而减小 。The effects of metal ions(Cu(Ⅱ), Zn(Ⅱ), Co(Ⅱ), Ni(Ⅱ), La(Ⅲ), Fe(Ⅲ)) on the critical micelle concentration(CMC) of ionic surfactants(sodium dodecyl sulfate(SDS) and hexadecyltrimethylammonium bromide(CTAB)) were investigated at 25℃±0.1℃, μ= 0.1mol/L(KNO 3), using conductivity method. A series of general empirical expressions about the relationship between the CMC values for SDS and CTAB and the concentrations of metal ions have been derived. The results showed that the CMC values for both SDS and CTAB decreased with increasing the concentrations of metal ions. This can be interpreted by the counterion effect and the entropy driving effect.

关 键 词：金属盐作用 表面活性剂 临界胶束浓度 电导法 反离子效应 熵驱动效应 金属离子浓度 

分 类 号：O647.2[理学—物理化学]