有机盐对水/AOT/醇反相微乳体系电导行为的影响

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

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ln!(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.

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 temperature on 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 Inσ 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.