中华医学超声杂志

应用化学 ›› 1997, Vol. 0 ›› Issue (6): 51-53.

• 研究论文 • 上一篇    下一篇

混合表面活性剂在非极性溶剂中的聚集行为

刘道军, 马季铭, 程虎民, 赵振国   

  1. 北京大学化学系, 北京 100871
  • 收稿日期:1997-05-26 修回日期:1997-09-02 出版日期:1997-12-10 发布日期:1997-12-10
  • 基金资助:
    国家自然科学基金

Aggregation Behaviour of Mixed Surfactants in Apolar Solvent

Liu Daojun, Ma Jiming, Cheng Humin, Zhao Zhenguo   

  1. Department of Chemistry, Peking University, Beijing 100871
  • Received:1997-05-26 Revised:1997-09-02 Published:1997-12-10 Online:1997-12-10

PDF

704

被引次数

8 | 1

摘要： 表面活性剂在非极性溶剂中的聚集行为比在水溶液中复杂得多. 水溶液中表面活性剂有一明确的临界胶束浓度(CMC),而在非极性溶剂中至今对CM C概念仍有怀疑[1], 但已有多种手段如染料增溶法、水增溶法、光散射法、荧光偏振、紫外和核磁共振谱等证实并测定了非极性溶剂中 CMC 的存在[1～5]. 表面活性剂在非极性溶剂中以非离子化状态存在, 其缔合主要靠两亲分子之间的偶极-偶极以及离子对相互作用, 那么在一种表面活性剂溶液中加入另一种表面活性剂, 即表面活性剂的复配, 必然对其聚集行为产生重大影响, 但迄今为止, 尚未见关于混合表面活性剂在非极性溶剂中聚集行为的报道. 本文采用碘光谱法和水增溶法测定了阴离子表面活性剂AOT 和非离子表面活性剂 Brij30 混合后在正庚烷中形成反胶束的 CMC, 以期考察表面活性剂的复配对其聚集行为的影响。

关键词: 混合表面活性剂, 非极性溶剂, 聚集行为, 碘光谱法, 水增溶, 临界胶束浓度

Abstract: The aggregation behaviour of mixed surfactants, sodium bis(2-ethylhexyl)sulfosuccinate and Brij30, in n-heptane has been investigated by iodine spectrometric method. The results showed that the CMC of the mixed surfactants firstly decreased and then increased with the increase of the proportion of nonionic surfactant Brij30 due to electric interaction and geometry of the surfactants. The water solubilization investigation indicated that at lower surfactant concentration the solubilizing capacity of the mixed reverse micelles firstly increased and then decreased with the increase of the proportion of Brij30. The difference of CMC values determined by iodine spectrometric method and water solubilization has been discussed.

Key words: mixed surfactant, apolar solvent, aggregation behaviour, iodine spetrometric method, water solubilization, critical micelle concentration

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