摘要
利用电导法测定了SDS(十二烷基硫酸钠)和SDBS(十二烷基苯磺酸钠)在溶剂DMF(N,N-二甲基甲酰胺)中的临界胶束浓度cCMC。测定不同温度下表面活性剂的电导率σ值,由σ-c作图的转折点求得cCMC;根据cCMC及热力学原理求得ΔGθm,ΔHθm及ΔSθm。结果表明:二者的cCMC值均大于水为溶剂时的cCMC值;随着温度的增加,cCMC增加,ΔGθm减小,ΔSθm基本保持不变,胶束过程伴随吸热现象。
The CMCs(critical micelle concentration) of SDS(sodium dodecyl sulfate),sodium dodecylbenzenesulfonate(SDBS) in DMF at different temperatures were measured by using the conductivity method.The curve of σ-c was mapped to achieve a turning point in CMC;in accordance with the CMC.According to the thermodynamics principle,ΔGmθ,ΔHmθand ΔSmθwere obtained,which show that the CMC values in DMFsolvent are larger than the values in water.As the temperature increases,the CMC value is increased,ΔGmθis reduced,and ΔSmθremained basically unchanged,with the endothermic phenomenon of micellar process.
出处
《实验技术与管理》
CAS
北大核心
2011年第3期39-41,共3页
Experimental Technology and Management
基金
江苏省滩涂生物资源与环境保护重点实验室开放基金(JLCBE06026):江苏省高校自然科学基础研究项目(08KJD150020)
江苏省盐城师范学院校自然科学研究项目(10YCKL015)
关键词
表面活性剂
临界胶束浓度
热力学函数
电导法
surfactant
critical micelle concentration(CMC)
thermodynamic functions
conductivity