W/O型微乳液活化能和导电机理研究  

Studies on the Activation Energies and the Mechanism of Electric Conductivity of W/O Type Microemulsions

作　　者：沈兴海[1] 王文清[1] 顾国兴[1] 

机构地区：[1]北京大学技术物理系,北京100871

出　　处：《高等学校化学学报》1993年第5期717-719,共3页Chemical Journal of Chinese Universities

摘　　要：电导行为是微乳液的重要性质之一。自Lagourette和Lagues发现了W/O型微乳液电导渗透(Percolation)现象后,人们开始了微乳液导电机理的研究。较流行的观点认为,界面层中表面活性剂分子的阴离子在微乳颗粒碰撞时发生跃迁而使W/O型微乳液具有导电性。Variations of activation energies (△E) with water content for microemulsions composed of SDS-alcohol (1-butanol-l-octanol)-heptane-water were determined. It is found that AS butanol system decreases slightly with the increase of water content, while that of pentanol system presents a maximum at its percolation threshold. For hexanol, heptanol and octanol systems, the activation energies exhibit rising trends before the limitations of added water. It is also found that the activation energy increases with the increase of the length of alcohol chain, which means that the longer the length of alcohol chain, the bigger the strength of the interfacial membranes of particles. Based on the above results, the mechanism of electric conductivity of W/O microemulsions is suggested, i. e. , cations' hopping through the membranes of particles among the inner water cores results in producing the electric conductivity.

关 键 词：微乳液 活化能 导电机理 

分 类 号：O648.23[理学—物理化学]