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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (9): 858-862. 上一篇    下一篇

研究论文

AOT/异辛烷/水微乳液中结晶紫与AOT相互作用的热力学研究

陈志云1，赵继华1，安学勤1,2，沈伟国*,1,3   

  1. (1兰州大学化学学院 兰州 730000)
    (2南京师范大学化学与环境科学学院 南京 210097)
    (3华东理工大学化学学院 上海 200237)
  • 投稿日期:2005-06-01 修回日期:2006-01-06 发布日期:2006-05-15
  • 通讯作者: 沈伟国

Thermodynamics of the Interaction between Crystal Violet and Aerosol OT in Aerosol OT/Isooctane/Water Microemulsion

CHEN Zhi-Yun1, ZHAO Ji-Hua1, AN Xue-Qin a,2, SHEN Wei-Guo*,1,3   

  1. (1 Department of Chemistry, Lanzhou University, Lanzhou 730000)
    (2 College of Chemistry and Environment Science, Nanjing Normal University, Nanjing 210097)
    (3 Department of Chemistry, East China University of Science and Technology, Shanghai 200237)
  • Received:2005-06-01 Revised:2006-01-06 Published:2006-05-15
  • Contact: SHEN Wei-Guo

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用紫外-可见分光光度法在不同温度下测定了结晶紫(CV)在双-2-乙基己基硫代琥珀酸钠(气溶胶OT或AOT)为表面活性剂的W/O微乳液中的吸光度. 根据结晶紫和AOT在微乳液水滴界面缔合的模型对实验数据进行处理, 结果表明, 随着微乳液中水与AOT的摩尔比w的减小和温度的升高, 结晶紫缔合度增大, 根据不同温度下的缔合平衡常数计算了反应的热力学函数, ΔrGm, ΔrHm和ΔrSm

关键词: 微乳液, 气溶胶OT, 异辛烷, 结晶紫, 缔合常数, Gibbs自由能, 焓, 熵

The absorbance measurements of CV (4,4',4''-tris(dimethylamino)triphenylmethyl chloride or crystal violet) in W/O microemulsions with surfactant sodium bis(2-ethylhexyl)sulfosuccinate (Aerosol OT, AOT) at various temperatures have been carried out by the UV-Vis spectrophotometer. An association model has been used to analyze the experimental data to obtain the association constant of CV and AOT at various temperatures. It was estimated that about up to 73% CV was associated by AOT, which resulted in a significant reduction of the effective concentration of CV and retarded the reaction of alkaline fading of CV in the microemulsion. The values of thermodynamics functions of association ΔrGm, ΔrHm and ΔrSm have also been calculated from the association constants at various temperatures.

Key words: microemulsion, Aerosol OT, isooctane, crystal violet, association constant, Gibbs free energy, enthalpy, entropy