AOT/水/甲苯微乳体系的第二维里系数和液滴间的相互作用  

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

作　　者：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] 

机构地区：[1]兰州大学化学系,兰州730000 [2]华东理工大学化学系,上海200237

出　　处：《物理化学学报》2011年第5期1026-1030,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20973061;21073063)资助项目~~

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-4.03×104J·mol-1和-139.8J·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.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.

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 

分 类 号：O642.42[理学—物理化学]