Micellar Exchange Kinetics of Quaternary Ammonium Type Gemini Surfactants Monitored by Nuclear Magnetic Resonance
文献类型：期刊论文
| 作者 | Liu, Jun2; Mao, Shi-zhen1; Liu, Mai-li1; Du, You-ru |
| 刊名 | CHINESE JOURNAL OF CHEMICAL PHYSICS
 |
| 出版日期 | 2018-04-01 |
| 卷号 | 31期号:2页码:159-164 |
| 关键词 | Gemini Surfactants Dynamic Nuclear Magnetic Resonance Molecular Exchange Exchange Rate Constant Apparent Activation Energy Two-step Exchange Mechanism |
| DOI | 10.1063/1674-0068/31/cjcp1708167 |
| 文献子类 | Article |
| 英文摘要 | 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, E-a(-), 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 10(3) s(-1), E-a(-) of 14-s-14 and 12-s-12 are respectively 54.04=73.64 and 33.42-47.09 kJ/mol. Furthermore, k(-) increases and E-a(-) 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. |
| WOS关键词 | ALKANEDIYL-ALPHA,OMEGA-BIS(DIMETHYLALKYLAMMONIUM BROMIDE) SURFACTANTS ; PRESSURE-JUMP ; DISSOCIATION ; SPECTROSCOPY ; ASSOCIATION ; EQUILIBRIA |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000432457300004 |
| 资助机构 | National Natural Science Foundation of China(21375145) ; National Natural Science Foundation of China(21375145) ; National Natural Science Foundation of China(21375145) ; National Natural Science Foundation of China(21375145) |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/12050]  |
| 专题 | 武汉物理与数学研究所_磁共振基础研究部 |
| 作者单位 | 1.Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Hubei, Peoples R China 2.Henan Univ Technol, Natl Engn Lab Wheat & Corn Further Proc, Zhengzhou 450000, Henan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Jun,Mao, Shi-zhen,Liu, Mai-li,et al. 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. |
| APA | Liu, Jun,Mao, Shi-zhen,Liu, Mai-li,&Du, You-ru.(2018).Micellar Exchange Kinetics of Quaternary Ammonium Type Gemini Surfactants Monitored by Nuclear Magnetic Resonance.CHINESE JOURNAL OF CHEMICAL PHYSICS,31(2),159-164. |
| MLA | Liu, Jun,et al."Micellar Exchange Kinetics of Quaternary Ammonium Type Gemini Surfactants Monitored by Nuclear Magnetic Resonance".CHINESE JOURNAL OF CHEMICAL PHYSICS 31.2(2018):159-164. |
入库方式： OAI收割
来源：武汉物理与数学研究所
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