高等学校化学学报

高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (5): 949.

• 研究论文 • 上一篇    下一篇

油/水界面表面活性剂的复配协同机制

谭晶1, 曹绪龙2, 李英1, 宋新旺2, 何秀娟1, 崔晓红2, 李振泉2   

    1. 山东大学胶体与界面教育部重点实验室, 济南 250100;
    2. 中国石油化学胜利油田地质科学研究院, 东营 257015
  • 收稿日期:2008-09-16 出版日期:2009-05-10 发布日期:2009-05-10
  • 通讯作者: 李英, 女, 博士, 教授, 主要从事胶体与界面化学研究, E-mail: yingli@sdu.edu.cn
  • 基金资助:

    中国石油化工重大先导试验项目(批准号: P03003)和中国石油化工重点项目(批准号: P04049)资助.

Investigate of Synergistic Effects Mechanism of Mixed Surfactants at the Oil/Water Interface

TAN Jing1, CAO Xu-Long2, LI Ying1*, SONG Xin-Wang2, HE Xiu-Juan1, CUI Xiao-Hong2, LI Zhen-Quan2   

    1. Key Laboratory for Colloid & Interface Chemistry of State Ministry of Education, Shandong University, Jinan 250100, China;
    2. Geological Scientific Research Institute, Shengli Oilfield, Dongying 257015, China
  • Received:2008-09-16 Online:2009-05-10 Published:2009-05-10
  • Contact: LI Ying, E-mail: yingli@sdu.edu.cn

PDF (PC)

被引次数

59

摘要：

采用耗散颗粒动力学(DPD)方法模拟了椰油酸二乙醇酰胺(6501)分别与十二烷基-α-烯烃磺酸钠(DAOS)、椰油酰胺丙基二甲基甜菜碱(CAB)和十二烷基苯磺酸钠(SDBS)复配体系中表面活性剂在油/水界面的排布行为, 探讨了盐度及分子结构对单一和复配表面活性剂界面活性的影响, 从界面效率、界面密度和分子排布等角度讨论了油水界面表面活性剂混合体系的复配协同增效机制.

关键词: 耗散颗粒动力学模拟, 界面密度, 界面效率, 超低界面张力, 复配增效

Abstract:

The method of dissipative particle dynamics was adopted to simulate the interfacial orientation of mixed systems between coconut diethanol amide(6501) and dodecyl alpha olefin sulfonate(DAOS),cocoanut amide propyl betaine(CAB), sodium dodecyl benzene sulfonate(SDBS) respectively at the oil/water interface. The effect of salt and molecular structure on the interfacial activity of pure and mixed surfactant systems were investigated. The mechanism of synergistic effects of mixed surfactants is analyzed from the aspects of interfacial efficiency, interfacial density, the array shape of molecules and so on. It was observed that nonionic surfactants have high absorption tendency but low interfacial efficiency, while ionic surfactants have high interfacial efficiency which can be increased with the increase of salinity but low absorption tendency. In the case that ionic or zwitterionic surfactants with higher interface adsorption tendency coexisting with nonionic surfactants, the cavities at the interface layer formed by ionic or zwitterionic surfactants are filled with nonionic surfactant clusters, synergistic effects could be introduced and interface tension could be decreased to ultra low value at low surfactant concentration because of high interfacial efficiency coursed by high interfacial density and high interfacial effectiveness of the mixed surfactants.

Key words: Dissipative particle dynamics, Interfacial density, Interfacial efficiency, Ultra low interfacial tension, Synergistic effect

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