物理化学学报 >> 2001, Vol. 17 >> Issue (12): 1122-1125.doi: 10.3866/PKU.WHXB20011213

研究简报 上一篇    下一篇

十二烷基甜菜碱/十二烷基硫酸钠复配体系的表面活性

张志庆;徐桂英;叶繁;郑立强;栾玉霞   

  1. 山东大学胶体与界面化学教育部重点实验室,济南 250100
  • 收稿日期:2001-05-07 修回日期:2001-09-17 发布日期:2001-12-15
  • 通讯作者: 徐桂英 E-mail:ckclab@sdu.edu.cn

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

Zhang Zhi-Qing;Xu Gui-Ying;Ye Fan;Zheng Li-Qiang;Luan Yu-Xia   

  1. Key Laboratory for Colloid and Interface Chemistry of Education Ministry,Shandong University, Jinan 250100
  • Received:2001-05-07 Revised:2001-09-17 Published:2001-12-15
  • Contact: Xu Gui-Ying E-mail:ckclab@sdu.edu.cn

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.

关键词: 十二烷基甜菜碱, 十二烷基硫酸钠, 临界胶束浓度, 表面张力, 增效作用

Abstract: 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 investi- gated. 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 remarkble influence on surface activity has been observed for alcohols of short chain, for example ethanol.

Key words: Dodecyl betaine(C12BE), Sodium dodecyl sulphate(SDS), Critical micell concentration (cmc), Surface tension, Synergism