物理化学学报 >> 2006, Vol. 22 >> Issue (01): 22-27.doi: 10.3866/PKU.WHXB20060105

研究论文 上一篇    下一篇

有机盐对水/AOT/醇反相微乳体系电导行为的影响

张晓光; 董金凤; 张高勇; 周晓海; 洪昕林   

  1. 武汉大学化学与分子科学学院, 武汉 430072
  • 收稿日期:2005-05-13 修回日期:2005-06-06 发布日期:2006-01-15
  • 通讯作者: 董金凤 E-mail:Jfdong@whu.edu.cn

The Effect of Organic Salts on the Conductance of the Water/AOT/Alkanol W/O Microemulsion

ZHANG Xiao-guang; DONG Jin-feng; ZHANG Gao-yong; ZHOU Xiao-hai; HONG Xinlin   

  1. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
  • Received:2005-05-13 Revised:2005-06-06 Published:2006-01-15
  • Contact: DONG Jin-feng E-mail:Jfdong@whu.edu.cn

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摘要： 用二(2-乙基己基)琥珀酸酯磺酸钠(AOT)为表面活性剂研究了以正构醇(己醇、庚醇、辛醇、癸醇)为连续相的微乳体系的电导行为, 结果表明只有水/AOT/癸醇体系有水诱导的电导渗滤现象. 研究了有机盐(胆酸钠、水杨酸钠)及温度对电导行为的影响, 发现庚醇、辛醇体系电导率随胆酸钠浓度的增加而减小, 而癸醇体系电导率不受影响; 庚醇、癸醇体系的电导率随水杨酸钠浓度的增加而增大; 在5～40 ℃范围内lnσ(电导率的自然对数)与温度成很好的线性关系, 无论有机盐存在与否都没有温度诱导的渗滤现象. 根据Arrhenius-type公式估算了体系的电导活化能.

关键词: 醇, 微乳液, 电导率, 渗滤, 有机盐, AOT

Abstract: The conductivity behaviour of water-in-alkanol(hexanol, heptanol, octanol, decanol) microemulsions, in which AOT was employed as surfactant, was investigated. The percolation phenomenon induced by water was found only in the water/AOT/decanol system. The effects of organic salts (sodium cholate and sodium salicylate) and temperatureon conductance were then studied. In heptanol and octanol systems the conductivity was decreased with the increase of sodium cholate concentration, whereas it was increased in the case of sodium salicylate. In decanol system the conductivity was hardly changed in the presence of both organic salts. The values of lnσ had a linear correlation with temperature in the range of 5～40 ℃. No percolation threshold induced by temperature was detected either in the absence or in the presence of organic salts. The activation energy for conductance was estimated according to the Arrhenius-type equation.

Key words: Alkanol, Microemulsion, Conductivity, Percolation, Organic salts, AOT