Micellar Exchange Kinetics of Quaternary Ammonium Type Gemini Surfactants Monitored by Nuclear Magnetic Resonance

doi:10.1063/1674-0068/31/cjcp1708167

CORC > 武汉物理与数学研究所 > 中国科学院武汉物理与数学研究所 > 磁共振基础研究部

	Micellar Exchange Kinetics of Quaternary Ammonium Type Gemini Surfactants Monitored by Nuclear Magnetic Resonance
	Liu, Jun 2; Mao, Shi-zhen 1; Liu, Mai-li 1; Du, You-ru
刊名	CHINESE JOURNAL OF CHEMICAL PHYSICS
	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)
内容类型	期刊论文
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.