1H NMR探究空间效应对表面活性剂复配体系中协同作用的影响

doi:10.11938/cjmr20172577

波谱学杂志 ›› 2018, Vol. 35 ›› Issue (1): 75-80.doi: 10.11938/cjmr20172577

¹H NMR探究空间效应对表面活性剂复配体系中协同作用的影响

陈晓瑛^1,2, 俞刚金^1,2, 毛诗珍¹, 刘买利¹, 杜有如¹

1. 波谱与原子分子物理国家重点实验室, 武汉磁共振中心(中国科学院武汉物理与数学研究所), 湖北武汉 430071;
2. 中国科学院大学, 北京 100049

收稿日期:2017-04-24 出版日期:2018-03-05 发布日期:2018-03-05
通讯作者: 毛诗珍,Tel:027-87197126,E-mail:maosz@wipm.ac.cn;刘买利,Tel:027-87197305,E-mail:ml.liu@wipm.ac.cn. E-mail:maosz@wipm.ac.cn;ml.liu@wipm.ac.cn
基金资助:
国家自然科学基金资助项目（21375145，21221064）.

An NMR Study on How Steric Effects Affect Synergistic Effects in Surfactant Mixtures

CHEN Xiao-ying^1,2, YU Gang-jin^1,2, MAO Shi-zhen¹, LIU Mai-li¹, DU You-ru¹

1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan(Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences), Wuhan 430071, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2017-04-24 Online:2018-03-05 Published:2018-03-05

摘要/Abstract

摘要： 通过核磁共振氢谱（¹H NMR）实验测量了温度为298.0 K时3种表面活性剂——十六烷基三甲基溴化铵（CTAB）、辛基苯基聚氧乙烯醚（TX-100）和十二烷基硫酸钠（SDS）组成的复配体系CTAB/TX-100、SDS/TX-100和CTAB/TX-100/SDS中各组分的化学位移，得到了各混合体系中CTAB、TX-100和SDS的临界胶束浓度（CMC）.对不同体系中各组分CMC随摩尔分数的变化曲线进行比较，发现了空间效应对表面活性剂复配体系中协同作用的影响在一定的情况下并不逊于静电相互作用：表面活性剂分子的截面积越大，对体系中其他组分的协同作用越强；当组分间存在弱的静电相互作用时，空间效应对协同作用起到更主要的影响.

关键词: 液体核磁共振, 表面活性剂复配体系, 空间效应, 协同作用

Abstract: NMR spectra of aqueous solutions of cetyltrimethylammonium bromide (CTAB)/triton X-100 (TX-100), sodium dodecyl sulfate (SDS)/TX-100 and CTAB/TX-100/SDS surfactant mixtures were acquired. The proton chemical shifts of each component and their dependence on concentration were determined and used to derive the critical micelle concentrations (CMCs) of CTAB, TX-100 and SDS in each mixture. It was found that, in several cases, the role played by the steric effect in the synergism of surfactant mixtures were not less than that of the electrostatic interaction. The larger the cross sectional area of the polar head was, the greater the synergy would be. It is concluded that the steric effect is a major player in the synergistic effect of surfactant mixtures, especially when the electrostatic interaction is weak.

Key words: liquid state NMR, surfactant mixtures, steric effect, synergistic effect

中图分类号:

O482.53

陈晓瑛, 俞刚金, 毛诗珍, 刘买利, 杜有如. ¹H NMR探究空间效应对表面活性剂复配体系中协同作用的影响[J]. 波谱学杂志, 2018, 35(1): 75-80.

CHEN Xiao-ying, YU Gang-jin, MAO Shi-zhen, LIU Mai-li, DU You-ru. An NMR Study on How Steric Effects Affect Synergistic Effects in Surfactant Mixtures[J]. Chinese Journal of Magnetic Resonance, 2018, 35(1): 75-80.

参考文献

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¹H NMR探究空间效应对表面活性剂复配体系中协同作用的影响

An NMR Study on How Steric Effects Affect Synergistic Effects in Surfactant Mixtures

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