物理化学学报 >> 2009, Vol. 25 >> Issue (07): 1297-1302.doi: 10.3866/PKU.WHXB20090702

研究论文 上一篇    下一篇

Triton X-100/CTAB在乙二醇/水混合溶剂中的热力学性质和胶团化行为

凌锦龙, 计兵, 莫勤华, 孙来玉   

  1. 湖州师范学院生命科学学院, 浙江 湖州 313000
  • 收稿日期:2009-02-10 修回日期:2009-03-17 发布日期:2009-06-26
  • 通讯作者: 凌锦龙 E-mail:lingjinlong@hutc.zj.cn

Micellization Behavior and Thermodynamic Properties of Triton X-100/CTAB Mixtures in Ethylene Glycol and Water Solvent Mixtures

LING Jin-Long, JI Bing, MO Qin-Hua, SUN Lai-Yu   

  1. Institute of Life Sciences, Huzhou Teachers College, Huzhou 313000, Zhejiang Province, P. R. China
  • Received:2009-02-10 Revised:2009-03-17 Published:2009-06-26
  • Contact: LING Jin-Long E-mail:lingjinlong@hutc.zj.cn

摘要:

利用表面张力法, 研究了非离子表面活性剂Triton X-100和离子表面活性剂十六烷基三甲基溴化铵(CTAB)混合体系在混合极性溶剂乙二醇/水(乙二醇的体积分数分别为5%、10%和20%)中的热力学性质和胶团化行为. 结果表明, 混合体系在乙二醇水溶液中存在协同效应, 临界胶束浓度随乙二醇含量的增加而增大. 利用Rubingh和Maeda模型计算了混合物中各组分在胶团相中的组成、相互作用参数以及自由能的贡献. 在实验研究的乙二醇浓度范围内, 发现该非离子/离子混合体系在离子组分摩尔分数约为0.3时, 协同效应最强.

关键词: 胶团化行为, 混合极性溶剂, 热力学性质, 正规溶液理论

Abstract:

The micellization behavior of the nonionic surfactant Triton X-100 (TX100) and the cationic cetyltrime-thylammonium bromide (CTAB) binary mixtures was investigated in ethylene glycol (EG) and water mixtures using a tensiometric technique. We show that synergistic effects exist for surface tension reduction and mixed micelle formation. When the molar fraction of CTAB in the mixture is about 0.3, the synergistic effect is at its optimum. The critical micelle concentration of the mixture increases as the content of EG in the mixed solvents increases. The established theories of Rubingh and Maeda were applied to determine the molar fraction of the different components, the interaction parameters and several thermodynamic properties of the micellar phase. We found that the micelle composition and the interaction parameters fromRubingh's model and Maeda's model were in agreement.

Key words: Micellization behavior, Mixed polar solvent, Thermodynamic property, Regular solution theory

MSC2000: 

  • O647