SDBS胶束体系热力学性质的研究  

Investigation of Thermodynamic Properties of SDBS Micellar System

作　　者：王琼[1] 王栋[1] 卜芳[1] 

机构地区：[1]大连理工大学环境与生命学院,大连116024

出　　处：《环境科学与技术》2009年第9期77-80,共4页Environmental Science & Technology

基　　金：国家自然科学基金项目(20577005)

摘　　要：文章选用十二烷基苯磺酸钠为研究对象,在(25±0.02)℃下,用Na+选择性电极法测量不同浓度的电动势(EMF),求出其临界胶束浓度(cmc)及反离子结合度,得出反离子与胶束结合的经验平衡常数Kass。在25～50℃范围内,每隔5℃电导率随温度的变化,求出对应温度下的cmc及其相应的一系列热力学参数。在实验温度范围内,吉布斯自由能均为负值,胶束化可以自发进行;焓变为正值,胶束化过程吸热,且属于熵驱动过程,有18.67%的T△micS0增加对胶束稳定性增加有贡献,以上特征参数的确定,可为研究表面活性剂溶液的各种应用以及处理技术提供重要参考。Sodium dodecyl benzene sulphate （SDBS）, a typical anion surfactant, is investigated in the lab regarding its micellar solutions. EMF values of the solutions with various concentrations are measured using Na^＋ selective electrode, based on which the critical micelle concentration（CMC） and counter ion association degree can be calculated, thus leading to Kass, the empirical equilibrium constant as well as the CMC values and the micellization thermodynamic parameters of SDBS at different temperatures. It is found that values of △micG^0 are negative in general at the room temperature of the lab, suggesting that micellization process can take place spontaneously. It is concluded that about 18.67% of T△micS^0 is contributive to stability of the micellar system.

关 键 词：SDBS EMF 临界胶束浓度 反离子结合度 电导率 胶束化热力学参数 

分 类 号：X124[环境科学与工程—环境科学]