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化学学报
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化学学报 ›› 2004, Vol. 62 ›› Issue (19): 1889-1893. 上一篇    下一篇

研究论文

动态光散射法研究季铵盐Gemini表面活性剂的胶团化行为

徐晓明, 吴章锋, 张春艳, 韩国彬   

  1. 厦门大学化学系, 固体表面物理化学国家重点实验室, 厦门, 361005
  • 投稿日期:2004-01-31 修回日期:2004-05-21 发布日期:2014-02-17
  • 通讯作者: 韩国彬,E-mail:hangb@jingxian.xmu.edu.cn E-mail:hangb@jingxian.xmu.edu.cn
  • 基金资助:
    国家自然科学基金(No.29973033)资助项目.

Micellar Growth of Quaternary Ammonium Gemini Surfactant in Aqueous Solutions Using Dynamic Light Scattering

XU Xiao-Ming, WU Zhang-Feng, ZHANG Chun-Yan, HAN Guo-Bin   

  1. Department of Chemistry, State Key Laboratory for Physical Chemistry of Solid Surface, Xiamen University, Xiamen 361005
  • Received:2004-01-31 Revised:2004-05-21 Published:2014-02-17

PDF

471

被引次数

52

用动态光散射技术在10～70℃温度范围内,通过测定胶团的平均流体力学半径随温度、盐浓度和联接基团长度的变化情况,研究联接基团为聚亚甲基链的阳离子季铵盐Gemini表面活性剂胶团在无机盐介质中的长大规律.实验结果表明,增加盐量、降低温度和减小联接基团的长度均使平均流体力学半径变大,Gemini表面活性剂胶团长大时是由球状转变为棒状.从实验测定的平流体力学半径求算了支配球-棒转变的平衡常数及热力学函数值,并用NNLS(non-negatively constrainedleast square)算法对胶团的粒径分布情况进行了分析.此外,对具有短联接基团的Gemini表面活性剂胶团长大所具有的独特性质进行了讨论.

关键词: Gemini表面活性剂, 平均流体力学半径, 动态光散射, 胶团长大

The micellar growth of quaternary ammonium Gemini surfactants containing methylene group spacer (referred to as C12-s-C12, 2Br) in inorganic salt (NaBr) media was investigated by using dynamic light scattering. The size of micelles increases with increasing salt concentration or decreasing temperature or decreasing the length of spacer chain. The enlarged micelles have a shape of prolate ellipsoid or rod. Based on these mean hydrodynamic radius (Rh) measurements, values of the thermodynamic parameter K governing the sphere to rod transition were determined. Numerical values of enthalpy and entropy change for this transition were deduced from the linear plot of ln K vs. 1/T. The novel micellar growth of C12-2-C12, 2Br was discussed. The distribution of micelle size was analyzed by using non-negatively constrained least square (NNLS) algorithm.

Key words: Gemini surfactant, mean hydrodynamic radius, dynamic light scattering, micellar growth