季铵盐型双子表面活性剂在空气-水界面的单分子膜(英文)  

Monolayers formed from quaternary ammonium gemini surfactants at air-water interface

作　　者：杨红伟[1] 朱谱新[1] 冯玉军[2] 孙玉海[2] 周栋梁[1] 吴大诚[1] 

机构地区：[1]四川大学纺织研究所,成都610065 [2]中国科学院成都有机化学所,成都610041

出　　处：《原子与分子物理学报》2006年第2期379-382,共4页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(50473050)

摘　　要：利用Langmuir膜天平测定不对称双子表面活性剂12-2-16和对称双子表面活性剂12-2-12在空气-水界面上形成单分子膜的表面压,通过单分子膜的π-A等温线、微分等温线和静态弹性,分析其相转变和成膜特性.结果表明,与传统阳离子表面活性剂DTAB比较,12-2-16、12-2-12比DTAB单分子膜的分子极限面积大,崩溃压高,并有较高的静态弹性,因而具有较高的凝聚性和稳定性,其中12-2-16单分子膜的凝聚性和稳定性最高.Monolayers of a dissymmetric cationic quaternary ammonium gemini surfactant 12-2-16 and a symmetric gemini surfactant 12-2-12 were formed in KSV 2000 Langmuir trough at air-water interface, respectively. The surface pressure of each monolayer was measured using the Wilhelmy plate technique. The features of monolayers at air-water interface were discussed by analyzing the π-A isotherm, the differential curve and the static surface elasticity of monolayers for 12-2-12 and 12-2-16. It was found that such parameters as the molecular limited area, the collapse surface pressure, the static surface elasticities are higher for 12-2-12 and 12-2-16, in comparison with those of a conventional cationic surfactant, dodecyl-trimethylammonium bromide （DTAB）. Among the surfactants studied, 12-2-16 monolayer has the highest cohesion and stability.

关 键 词：阳离子型双子表面活性剂 单分子膜 微分等温线 静态弹性 

分 类 号：O647[理学—物理化学]