十二烷基甜菜碱/十二烷基硫酸钠复配体系的表面活性  

Surface Activity of Mixed System of Dodecyl Betaine and Sodium Dodecyl Sulphate

作　　者：张志庆[1] 徐桂英[1] 叶繁[1] 郑立强[1] 栾玉霞[1] 

机构地区：[1]山东大学胶体与界面化学教育部重点实验室,济南250100

出　　处：《物理化学学报》2001年第12期1122-1125,共4页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金资助项目(29973023)

摘　　要：研究了两性表面活性剂十二烷基甜菜碱（Ｃ１２ＢＥ）和阴离子型表面活性剂十二烷基硫酸钠（ＳＤＳ）复配体系的形成胶束能力．降低表面张力效率，降低表面张力能力三种增效作用 发现Ｃ１２ＢＥ和ＳＤＳ摩尔比为６：４时增效作用最显著．并考察了盐、醇对复配体系表面活性的影响，结果表明，加盐能导致表面活性的提高．加醇的机理比较复杂，乙醇对复配体系表面活性影响不大，而正丁醇影响则比较显著．The ability of forming micell, the efficiency and the ability of reducing surface tension by the interaction of zwitterionic and anionic surfactants (C12H25N+ (CH3)(2) CH2COO- /C12H25SO4Na) has been investigated. It is found that when the molar fraction of C12BE is about 0.6, the surface activity shows a maximum. The influence of NaCl and alcohols on surface properties of the mixed system has also been studied. The surface activity is enhanced and the cmc value of C12BE/SDS system is reduced with the increase of NaCl concentration, because sodium ions induce a decrease of electrostatic repulsion between hydrophilic groups in surfactant molecules. The effect is more complex with the addition of alcohols, the surface activity improves with increasing the volume fraction of n-butanol. But no remarkable influence on surface activity has been observed for alcohols of short chain, for example ethanol.

关 键 词：十二烷基甜菜碱 十二烷基硫酸钠 表面活性剂 临界胶束浓度 表面张力 表面活性 增效作用 复配体系 

分 类 号：O647[理学—物理化学]