Citation: PENG Xu-Hong, ZHENG Pei-Zhu, MA Yuan-Ming, YIN Tian-Xiang, AN Xue-Qin, SHEN Wei-Guo. The Second Virial Coefficient and Droplet Interaction of AOT/Water/Toluene Microemulsion[J]. Acta Physico-Chimica Sinica, ;2011, 27(05): 1026-1030. doi: 10.3866/PKU.WHXB20110503 shu

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

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 Date: 27 December 2010
Available Online: 25 March 2011
Fund Project: 国家自然科学基金(20973061, 21073063)资助项目 (20973061, 21073063)

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.
- Microemulsion,
- AOT,
- The second Virial coefficient,
- Droplet interaction,
- Static light scattering
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