物理化学学报 >> 2007, Vol. 23 >> Issue (03): 317-321.doi: 10.1016/S1872-1508(07)60025-4

研究论文 上一篇    下一篇

季铵盐型双子表面活性剂C14-s-C14·2Br的聚集行为

崔晓红;陈洪;杨晓焱;刘爱红;毛诗珍;程功臻;袁汉珍;罗平亚;杜有如   

  1. (中国科学院武汉物理与数学研究所, 波谱与原子分子物理国家重点实验室, 武汉 430071; 西南石油学院, 油气藏地质及开发工程国家重点实验室, 四川 南充 637001; 武汉大学化学与分子科学学院, 武汉 430072)
  • 收稿日期:2006-07-21 修回日期:2006-09-04 发布日期:2007-03-07
  • 通讯作者: 毛诗珍 E-mail:maosz@wipm.ac.cn

Aggregation Behavior of Quaternary Ammonium Dimeric Surfactant C14-s-C14·2Br Micelles

CUI Xiao-Hong;CHEN Hong;YANG Xiao-Yan;LIU Ai-Hong;MAO Shi-Zhen;CHENG Gong-Zhen;YUAN Han-Zhen;LUO Ping-Ya;DU You-Ru   

  1. (State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering, Southwest Petroleum Institute, Nanchong 637001, Sichuan Province, P. R. China; College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, P. R. China)
  • Received:2006-07-21 Revised:2006-09-04 Published:2007-03-07
  • Contact: MAO Shi-Zhen E-mail:maosz@wipm.ac.cn

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摘要： 用1H NMR弛豫、2D NOESY研究了双子表面活性剂14-s-14胶束在重水溶液中的聚集行为. 1H NMR自旋-晶格、自旋-自旋弛豫实验表明, 联结基团质子及其邻近的亚甲基质子的运动受到严重限制, 表明这些质子形成胶束疏水核的壳层；而远离极性头的疏水质子的运动则相对自由, 说明其位于胶束的内部. 14-s-14系列(s=2, 3, 4)的弛豫实验结果还表明, 联结基团越短, 分子的碳氢链在疏水核中的排列越紧密. 与14-4-14的对应单链表面活性剂TTAB相比, 它们的分子运动更受限制. 14-4-14的2D NOESY 谱给出了与16-4-16类似的交叉峰信息, 这表明14-4-14同16-4-16一样, 形成了表面不平滑的球形胶束. 因此, 烷烃链的长短对胶束中分子的排列方式没有影响.

关键词: NMR, 双子表面活性剂, 胶束;弛豫, 2DNOESY

Abstract: The aggregation behavior of gemini surfactants 14-s-14 micelles in heavy water solutions was studied using 1H NMR relaxation and two-dimensional nuclear Overhauser enhancement spectroscopy (2D NOESY). Spin-lattice and spin-spin relaxation measurements of the protons showed that the motion of the spacer protons and a part of the methylene protons next to the polar head group was seriously restricted. Therefore, these protons should be involved in the formation of the surface layer of the hydrophobic micellar core. The hydrophobic protons that were away from the polar head group were situated internal in the micellar core and moved relatively freely. Relaxation measurements of the 14-s-14 series(s=2, 3, 4) also showed that the molecules were more tightly packed as the length of the spacer decreased. Their motion was relatively more restricted than those of TTAB, the monomeric homologue of 14-4-14. 2D NOESY spectrum of 14-4-14 exhibited the same pattern as that of 16-4-16. This showed that the micelles of 14-4-14 were spherical, the surface of which exhibited a saw-toothed form, similar to that of 16-4-16. Consequently, the length of the alkyl chain did not have any effect on the relative arrangement of molecules in the micelles.

Key words: NMR, Gemini surfactant, Micelle, Relaxation, 2D NOESY