偶联表面活性剂和传统表面活性剂混合水溶液的性质

研究了偶联正离子表面活性剂12-3-12，2Br^-和传统负离子表面活性剂SDS复配体系的液相性质，考察了两表面活性剂的混合比对复配体系的表观现象、流变性、电导性等物理化学性质的影响。结果表明该体系同传统的正、负离子表面活性荆复配体系相似，在一定的混合比范围内出现了液晶区和双水相区。偶联表面活性剂的特殊结构及其与传统表面活性荆的协同作用决定了此体系中液晶相、双水相的独特性质。此外，溶液混合比的变化对溶液的流变性及导电能力的影响很大。冷冻蚀刻技术，负染色技术以及透射电子显微技术对溶液内部胶束微观结构的研究表明，溶液的混合比影响着胶束的形态从而影响了溶液的粘度及电导率。

Properties of the Mixed Aqueous Solutions of Gemini Surfactant and Conventional Surfactant

The bulk properties of the mixed aqueous solutions of cationic gemini surfactant 12-3-12, 2Br~- and conventional anionic surfactant SDS, and the effects of mixing ratio on the appearances, viscosity, electrical conductivity of the mixed solutions have been investigated. Results show that just as the conventional anionic and cationic aqueous solutions, present system can form liquid crystal and aqueous two-phase system (ATPS) under certain mixing ratio. Their unique properties are dependent upon the unique structure of gemini surfactant and the synergistic effect of Geminis and conventional surfactants. Moreover, the changes of mixing ratio have great effects on the viscosity, electrical conductivity of the mixed solutions. Results achieved by freeze etching technique, negative-staining technique and transition electron microscope show that the mixing ratio affects the microstructure of surfactant aggregates and thus leads to the variation of solution viscosity and electrical conductivity.