利用1H NMR探究混合离子型/非离子型表面活性剂临界胶束浓度降低的实质

doi:10.11938/cjmr20172610

波谱学杂志 ›› 2019, Vol. 36 ›› Issue (2): 219-224.doi: 10.11938/cjmr20172610

利用¹H NMR探究混合离子型/非离子型表面活性剂临界胶束浓度降低的实质

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

收稿日期:2017-12-12 发布日期:2018-01-30
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:
the National Natural Science Foundation of China (21375145, 21221064).

Mixing-Induced Decreases in Critical Micelle Concentration in Aqueous Solution of Surfactants:Probing into the Mechanisms with ¹H NMR Spectroscopy

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:2017-12-12 Published:2018-01-30
Supported by:
the National Natural Science Foundation of China (21375145, 21221064).

摘要/Abstract

摘要： 利用¹H NMR技术研究了离子/非离子表面活性剂形成的二元混合体系，结果显示表面活性剂的混合导致各组分的临界胶束浓度（CMC）均比各自纯溶液有所降低，用吸附平衡理论清楚地解释了这个现象.通过定量分析，发现不同的表面活性剂混合使得其组分CMC降低的程度各异，可以理解为它们吸附于界面单分子吸附层上的分子之间相互作用的不同（相吸或相斥）引起的.由此揭示了"协同效应"的实质，可以为选择适当的表面活性剂类型和混合比例以达到预期的性能提供有力的参考.

关键词: 核磁共振(NMR), 混合表面活性剂, 临界胶束浓度(CMC), 吸附平衡, 协同效应

Abstract: As revealed by ¹H NMR experiments, the critical micelle concentration (CMC) of a surfactant in the aqueous solution decreases when a surfactant of different type is mixed in, a phenomenon that has been explained by the adsorption equilibrium theory. It has also been observed that the extents of mixing-induced reduction in CMC values differ among different surfactant types, depending on the interactions (absorption or repulsion) between the adsorbed surfactant molecules and the adsorption mono-layer. The results of ¹H NMR experiments provided a clear picture for the so-called "synergistic effect", and thus might be used to guide the optimization of surfactant mixture formula to achieve desired performance.

Key words: nuclear magnetic resonance (NMR), mixed surfactants, critical micelle concentrations (CMC), adsorption equilibrium, synergistic effect

中图分类号:

O482.53

陈晓瑛, 俞刚金, 毛诗珍, 刘买利, 杜有如. 利用¹H NMR探究混合离子型/非离子型表面活性剂临界胶束浓度降低的实质[J]. 波谱学杂志, 2019, 36(2): 219-224.

CHEN Xiao-ying, YU Gang-jin, MAO Shi-zhen, LIU Mai-li, DU You-ru. Mixing-Induced Decreases in Critical Micelle Concentration in Aqueous Solution of Surfactants:Probing into the Mechanisms with ¹H NMR Spectroscopy[J]. Chinese Journal of Magnetic Resonance, 2019, 36(2): 219-224.

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利用¹H NMR探究混合离子型/非离子型表面活性剂临界胶束浓度降低的实质

Mixing-Induced Decreases in Critical Micelle Concentration in Aqueous Solution of Surfactants:Probing into the Mechanisms with ¹H NMR Spectroscopy

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