物理化学学报 >> 1988, Vol. 4 >> Issue (02): 129-135.doi: 10.3866/PKU.WHXB19880204

研究论文 上一篇    下一篇

辛基甲基亚砜与离子型表面活性剂在水溶液中的相互作用

朱德民; 赵国玺   

  1. 北京大学化学系
  • 收稿日期:1986-10-25 修回日期:1987-04-07 发布日期:1988-04-15
  • 通讯作者: 朱德民

INTERACTIONS BETWEEN OCTYLMETHYLSULFOXIDE AND IONIC SURFACTANTS IN AQUEOUS SOLUTIONS

Zhu Demin*; Zhao Guoxi   

  1. Department of Chemistry; Peking University
  • Received:1986-10-25 Revised:1987-04-07 Published:1988-04-15
  • Contact: Zhu Demin

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摘要： 本文用测定表面张力的方法研究了非离子表面活性剂辛基甲基亚砜(OMS)分别与离子型表面活性剂C_(10)H_(21)SO_4N_a(SDeS)、C_7F_(15)COONa(SPFO), C_(10)H_(21)N(CH_3)_3B_r(DeTAB)等在水溶液中的相互作用。发现上述混合体系的胶团形成及表面吸附都有不同程度的增效作用; 表面活性分子在吸附层中的相互作用参数β~s以及在胶团中的相互作用参数β~m均为负值并有一定变化规律; OMS与DeTAB的相互作用较OMS与SDeS或SPFO的相互作用弱得多; 此现象自OMS分子在水溶液中的质子化作用得到解释。

Abstract: The interactions between nonionic surfactant octylmethylsulfoxide (OMS) and ionic surfactants sodium decylsulfate(SDeS), sodium perfluorooctanoate(SPFO), and decyltrimethylammonium bromide (DeTAB) in aqueous solutions have been investi gated. The following results are obtained:
1) The critical micelll concentration (cmc)-mole fraction(α) curves of all mixtures discussed are lower than the ideal ones.
2) The surface adsorptions at cmc(Γ_(cmc,T)) of OMS-SDeS, OMS-SPFO mixtures have maximum values. But those of OMS-DeTAB mixtures have not.
3) The surface tension at cmc (γ_(cmc)) of OMS-SPFO solution can reach a value below 16 mNm~(-1) which is lower than those of single OMS and SPFO. However, γ_(cmc) of the other two kinds of mixtures are lower than that of single SDeS or DeTAB, but higher than that of single OMS.
4) All of the molecular interaction parameters of surfactants in micelles (β~m) and in surface layers (β~s) are negtive. Their variations are also discussed.
5) Interactions of OMS-SDeS, and OMS-SPFO are much stronger than that of OMS-DeTAB. It is explained with protonation of some of the oxygen atoms of OMS molecules in aqueous solutions.