| NMR方法监测季铵型双子表面活性剂的胶束交换动力学 |
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| 引用本文： | 刘君,杜有如,毛诗珍,刘买利.NMR方法监测季铵型双子表面活性剂的胶束交换动力学[J].化学物理学报,2018,31(2):159-164. |
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| 作者姓名： | 刘君 杜有如 毛诗珍 刘买利 |
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| 作者单位： | 河南工业大学, 小麦和玉米国家工程实验室, 郑州 450000,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,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,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 |
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| 基金项目： | This work was supported by the National Natural Science Foundation of China (No.21375145). |
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| 摘 要： |
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| 收稿时间： | 2017/9/2 0:00:00 |
| 修稿时间： | 2017/12/28 0:00:00 |
Micellar Exchange Kinetics of Quaternary Ammonium Type Gemini Surfactants Monitored by Nuclear Magnetic Resonance |
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| Jun Liu,You-ru Du,Shi-zhen Mao and Mai-li Liu.Micellar Exchange Kinetics of Quaternary Ammonium Type Gemini Surfactants Monitored by Nuclear Magnetic Resonance[J].Chinese Journal of Chemical Physics,2018,31(2):159-164. |
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| Authors: | Jun Liu You-ru Du Shi-zhen Mao and Mai-li Liu |
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| Institution: | National Engineering Laboratory of Wheat & Corn Further Processing, Henan University of Technology, Zhengzhou 450000, China,State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China,State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China and State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | The dynamic NMR (DNMR) method was used to detect kinetic parameters of the molecular exchange process between monomers in bulk solution and those in the micelle for Gemini surfactants,12-s-12 and 14-s-14(s=2,3 and 4).The escape rate constant,k-,was derived based on the simplified equations of DNMR theory,and the apparent activation energy of escape,Ea-,was obtained based on the Arrhenius equation through temperature variation experiments.Results show that the orders of magnitude of k- for 14-s-14 and 12-s-12 are respectively 10 and 103 s-1,Ea- of 14-s-14 and 12-s-12 are respectively 54.04-73.64 and 33.42-47.09 kJ/mol.Furthermore, increases and Ea- decreases with the spacer length growing.In combination with the micro-polarity measurements,it was revealed that molecules of 14-s-14 and 12-s-12 have to experience conformation changes when escaping from the micelles.The two-step molecular exchange mechanism for Gemini surfactants was therefore supported. |
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| Keywords: | Gemini surfactants Dynamic nuclear magnetic resonance Molecular exchange Exchange rate constant Apparent activation energy Two-step exchange mechanism |
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