NMR investigation on micellization of ammonium/tetraalkylammonium   perfluorooctanoates

doi:10.1016/j.colsurfa.2007.12.033

CORC > 北京大学 > 化学与分子工程学院

	NMR investigation on micellization of ammonium/tetraalkylammonium perfluorooctanoates
	Xing, Hang ; Lin, Shrong-Shi ; Lu, Run-Chao ; Xiao, Jin-Xin
刊名	colloids and surfaces a physicochemical and engineering aspects
	2008
关键词	fluorinated surfactant tetraalkylammonium perfluorooctanoate counterion conformation NMR ANIONIC SURFACTANTS AQUEOUS-SOLUTIONS LITHIUM PERFLUOROOCTYLSULFONATES AGGREGATION NUMBER DODECYL-SULFATE COUNTERION MICELLES TETRAETHYLAMMONIUM H-1 RELAXATION
DOI	10.1016/j.colsurfa.2007.12.033
英文摘要	The micellization of ammonium/tetraalkylammonium perfluorooctanoates (C7F15COON(CnH2n+1)(4), n = 0-4) was investigated by H-1 and F-19 NMR. Tetraalkylammonium chlorides were also studied by H-1 NMR to simulate the layer of bound counterions on micellar surface. The critical micelle concentration (cmc) determined by NMR was found to decrease with the size of counterions. It was directly proved from the chemical shift change that the longer the alkyl moieties of counterions, the tighter is the contact between perfluorooctanoate headgroups and counterions. Possible conformations of counterions bound to micellar surface were proposed from the chemical shift analysis. The hydrophobicity and structures of counterions with long alkyl chains such as N(C3H7)(4)(+) and N(C4H9)(4)(+) seemed to result in folded, shrink or penetration conformation, rather than ideal models with symmetrically stretched alkyl chains. (C) 2007 Elsevier B.V. All rights reserved.; Chemistry, Physical; SCI(E); EI; 6; ARTICLE; 1-3; 199-205; 318
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/151497]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Xing, Hang,Lin, Shrong-Shi,Lu, Run-Chao,et al. NMR investigation on micellization of ammonium/tetraalkylammonium perfluorooctanoates[J]. colloids and surfaces a physicochemical and engineering aspects,2008.
APA	Xing, Hang,Lin, Shrong-Shi,Lu, Run-Chao,&Xiao, Jin-Xin.(2008).NMR investigation on micellization of ammonium/tetraalkylammonium perfluorooctanoates.colloids and surfaces a physicochemical and engineering aspects.
MLA	Xing, Hang,et al."NMR investigation on micellization of ammonium/tetraalkylammonium perfluorooctanoates".colloids and surfaces a physicochemical and engineering aspects (2008).