物理化学学报 >> 2011, Vol. 27 >> Issue (05): 1026-1030.doi: 10.3866/PKU.WHXB20110503

热力学,动力学和结构化学 上一篇    下一篇

AOT/水/甲苯微乳体系的第二维里系数和液滴间的相互作用

彭旭红1, 郑佩珠2, 马元明1, 殷天翔2, 安学勤2, 沈伟国1,2   

  1. 1. 兰州大学化学系, 兰州 730000;
    2. 华东理工大学化学系, 上海 200237
  • 收稿日期:2010-12-27 修回日期:2011-03-15 发布日期:2011-04-28
  • 通讯作者: 沈伟国 E-mail:shenwg@lzu.edu.cn
  • 基金资助:

    国家自然科学基金(20973061, 21073063)资助项目

The Second Virial Coefficient and Droplet Interaction of AOT/Water/Toluene Microemulsion

PENG Xu-Hong1, ZHENG Pei-Zhu2, MA Yuan-Ming1, YIN Tian-Xiang2, AN Xue-Qin2, SHEN Wei-Guo1,2   

  1. 1. Department of Chemistry, Lanzhou University, Lanzhou 730000, P. R. China;
    2. Department of Chemistry, East China University of Science and Technology, Shanghai 200237, P. R. China
  • Received:2010-12-27 Revised:2011-03-15 Published:2011-04-28
  • Contact: SHEN Wei-Guo E-mail:shenwg@lzu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20973061, 21073063).

摘要:

在一系列温度下通过对水与丁二酸双(2-乙基己基)酯磺酸钠(AOT)摩尔比为12、不同浓度的AOT/水/甲苯微乳液进行静态光散射测量, 获得液滴的相对分子质量、AOT的聚集数、液滴半径和不同温度下的第二维里系数. 利用第二维里系数与温度的关系获得液滴的相互作用焓和熵, 分别为-4.03×104 J·mol-1和-139.8 J·mol-1·K-1, 说明AOT/水/甲苯微乳液滴间表面活性剂疏水链相互交叉渗透的能量变化为负值, 交叉渗透为焓驱动.

关键词: 微乳液, AOT, 第二维里系数, 液滴间相互作用, 静态光散射

Abstract:

Static light scattering measurements on a microemulsion of sodium bis(2-ethylhexyl) sulfosuccinate (AOT)/water/toluene with a water to AOT molar ratio of 12 at a series of temperatures and droplet concentrations were carried out to obtain their molecular weights, aggregation number, radius, and the second Virial coefficient of the droplets at various temperatures and concentrations. The dependence of the second Virial coefficient on the temperature was used to obtain the enthalpy and entropy of the interaction between the droplets, which were -4.03×104 J·mol-1 and -139.8 J·mol-1·K-1, respectively. These values indicate that the energy of surfactant penetration between the droplets in the AOT/water/toluene microemulsion system is negative and the penetration is driven by enthalpy.

Key words: Microemulsion, AOT, The second Virial coefficient, Droplet interaction, Static light scattering

MSC2000: 

  • O642