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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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尾链含对硝基苯醚基团的阳离子Gemini表面活性剂的胶束化热力学
DOI: 10.6023/A13010080, PP. 897-905
Keywords: Gemini表面活性剂,胶束化,等温滴定微量量热,相分离模型,质量作用模型
Abstract:
利用等温滴定微量量热法和电导法研究了具有不同疏水链长并且疏水链尾部含有对硝基苯醚基团的Gemini表面活性剂胶束化过程的热力学,分别利用相分离模型和质量作用模型对观察焓与浓度的关系曲线进行拟合,获得了胶束化过程的热力学参数.两种模型获得的胶束化焓一致,均为较大负值,而吉布斯自由能却相差较大.用相分离模型得到的胶束化过程的热容变化均为负值,并随链长增加绝对值增大,胶束化过程总的热容变化主要来自非极性的烷基链去水合产生的热容变化,证明处于疏水链末端的对硝基苯醚基团在表面活性剂形成胶束后依然与水相接触.质量作用模型获得的胶束聚集数随疏水链长增加逐渐下降,这是由具有长疏水链的表面活性剂形成预胶束所导致.
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