阴阳离子表面活性剂复配自发形成囊泡的研究

采用阳离子表面活性剂十六烷基三甲基溴化铵分别与阴离子表面活性剂十二烷基苯磺酸钠、 十二烷基磺酸钠及十二烷基硫酸钠复配, 3种体系的水溶液在适当条件下均可自发形成囊泡. 结果表明, 虽然3种阴离子表面活性剂的分子结构相似, 但在与同一种阳离子表面活性剂复配形成囊泡时的复配比例及囊泡的稳定性却有很大区别. 考察了3种体系囊泡自发形成时的复配比例, 并探讨了囊泡的形成机理及其时间稳定性,利用负染TEM技术观察了囊泡的形貌.

Spontaneous Formation of Vesicles from Aqueous Solution of Cationic and Anionic Surfactants

The formation and stability of vesicles from the mixture of cationic cetyltrimethylammoniium bromide (CTAB) and anionic surfactant were investigated. The three different anionic surfactants were sodium dodecylbenzenesulfonate (SDBS), sodium dodecyl sulfonate (SDS) and sodium dodecyl sulfate (SLS) respectively. Vesicles all can form in systems cationic and each of three anionic (cationanionic) surfactants. The experimental results show that although three anionic surfactants have similar molecular structure, the mixed ratio of catanionic surfactant with each anionic surfactant was entirely different for the formation of vesicles. The stabilities of vesicles were different either. The present paper discusses the formation of vesicles according to the physical properties of surfactants and investigates the stability of vesicles. The TEM technique was used to observe the shape of vesicles.