Probing Dynamics and Mechanism of Exchange Process of Quaternary Ammonium Dimeric Surfactants, 14-s-14, in the Presence of Conventional Surfactants

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

	Probing Dynamics and Mechanism of Exchange Process of Quaternary Ammonium Dimeric Surfactants, 14-s-14, in the Presence of Conventional Surfactants
	Liu, Jun 1,2; Jiang, Yan 1; Chen, Hong 3; Mao, Shi Zhen 1; Du, You Ru 1; Liu, Mai Li 1
刊名	JOURNAL OF PHYSICAL CHEMISTRY B
	2012-12-27
卷号	116 期号:51 页码:14859-14868
英文摘要	In this Article, we investigated effects of different types of conventional surfactants on exchange dynamics of quaternary ammonium dimeric surfactants, with chemical formula C14H29N+(CH3)(2)-(CH2)(5)-N+(CH3)(2)C14H29 center dot 2Br(-), or 14-s-14 for short. Two nonionic surfactants, TritonX-100 (TX-100) and polyethylene glycol (23) laurylether (Brij-35), and one cationic surfactant, n-tetradecyltrimethyl ammonium bromide (TTAB), and one ionic surfactant, sodium dodecyl sulfate (SDS) were chosen as typical conventional surfactants. Exchange rates of 14-s-14 (s = 2, 3, and 4) between the micelle form and monomer in solution were detected by two NMR methods: one-dimensional (1D) line shape analysis and two-dimensional (2D) exchange spectroscopy (EXSY). Results show that the nonionic surfactants (TX-100 and Brij-35), the cationic surfactant (TTAB), and the ionic surfactant (SDS) respectively accelerated, barely influenced, and slowed the exchange rate of 14-s-14. The effect mechanism was investigated by the self-diffusion experiment, relaxation time measurements (T-2/T-1), the fluorescence experiment (I-1/I-3) and observed chemical shift variations. Results reveal that, nonionic conventional surfactants (TX-100 and Brij-35) loosened the molecule arrangement and decreased hydrophobic interactions in the micelle, and thus accelerated the exchange rate of 14-s-14. The cationic conventional surfactant (TTAB) barely changed the molecule arrangement and thus barely influenced the exchange rate of 14-s-14. The ionic conventional surfactant (SDS) introduced the electrostatic attraction effect, tightened the molecule arrangement, and increased hydrophobic interactions in the micelle, and thus slowed down the exchange rate of 14-s-14. Additionally, the two-step exchange mechanism of 14-s-14 in the mixed solution was revealed through interesting variation tendencies of exchange rates of 14-s-14.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Chemistry, Physical
研究领域[WOS]	Chemistry
关键词[WOS]	ALKANEDIYL-ALPHA,OMEGA-BIS(DIMETHYLALKYLAMMONIUM BROMIDE) SURFACTANTS ; GEMINI SURFACTANTS ; MICELLAR EQUILIBRIA ; MIXED MICELLIZATION ; CHEMICAL RELAXATION ; AQUEOUS-SOLUTION ; KINETICS ; MIXTURES ; NMR ; AGGREGATION
收录类别	SCI
语种	英语
WOS记录号	WOS:000312680900014
公开日期	2015-07-14
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/1664]
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, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100029, Peoples R China 3.SW Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Peoples R China
推荐引用方式 GB/T 7714	Liu, Jun,Jiang, Yan,Chen, Hong,et al. Probing Dynamics and Mechanism of Exchange Process of Quaternary Ammonium Dimeric Surfactants, 14-s-14, in the Presence of Conventional Surfactants[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2012,116(51):14859-14868.
APA	Liu, Jun,Jiang, Yan,Chen, Hong,Mao, Shi Zhen,Du, You Ru,&Liu, Mai Li.(2012).Probing Dynamics and Mechanism of Exchange Process of Quaternary Ammonium Dimeric Surfactants, 14-s-14, in the Presence of Conventional Surfactants.JOURNAL OF PHYSICAL CHEMISTRY B,116(51),14859-14868.
MLA	Liu, Jun,et al."Probing Dynamics and Mechanism of Exchange Process of Quaternary Ammonium Dimeric Surfactants, 14-s-14, in the Presence of Conventional Surfactants".JOURNAL OF PHYSICAL CHEMISTRY B 116.51(2012):14859-14868.