| SDS和SDBS在N,N-二甲基甲酰胺中的临界胶束浓度测定及热力学分析 |
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| 引用本文： | 王新红,戴兢陶,顾云兰.SDS和SDBS在N,N-二甲基甲酰胺中的临界胶束浓度测定及热力学分析[J].实验技术与管理,2011,28(3):39-41. |
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| 作者姓名： | 王新红 戴兢陶 顾云兰 |
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| 作者单位： | 江苏省盐城师范学院,江苏省滩涂生物资源与环境保护重点实验室,江苏,盐城,224051;江苏盐城师范学院,化学化工学院,江苏,盐城,224051 |
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| 基金项目： | 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，校自然科学研究项目 |
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| 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。
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| 关 键 词： | 表面活性剂 临界胶束浓度 热力学函数 电导法 |
Determination of CMC of SDS/SDBS in DMF and thermodynamic analysis |
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| Wang Xinhong,Dai Jingtao,Gu Yunlan.Determination of CMC of SDS/SDBS in DMF and thermodynamic analysis[J].Experimental Technology and Management,2011,28(3):39-41. |
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| Authors: | Wang Xinhong Dai Jingtao Gu Yunlan |
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| Institution: | 1,2(1.Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection,Yancheng Teachers University,Yancheng 224051,China;2.School of Chemistry & Chemical Engineering,Yancheng Teachers University,Yancheng 224051,China) |
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| Abstract: | 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. |
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| Keywords: | surfactant critical micelle concentration(CMC) thermodynamic functions conductivity |
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