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NMR investigation on micellization of ammonium/tetraalkylammonium perfluorooctanoates
Xing, Hang1; Lin, Shrong-Shi1; Lu, Run-Chao1; Xiao, Jin-Xin1,2
2008-04-01
Source PublicationCOLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
ISSN0927-7757
Volume318Issue:1-3Pages:199-205
AbstractThe 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.
KeywordFluorinated Surfactant Tetraalkylammonium Perfluorooctanoate Counterion Conformation Nmr
DOI10.1016/j.colsurfa.2007.12.033
Indexed BySCI
Language英语
WOS IDWOS:000255623000022
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/63920
Collection中国科学院化学研究所
Corresponding AuthorXiao, Jin-Xin
Affiliation1.Peking Univ, Beijing Natl Lab Mol Sci, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
2.Beijing FLUOBON Surfactant Inst, Beijing 100080, Peoples R China
Recommended Citation
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,2008,318(1-3):199-205.
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,318(1-3),199-205.
MLA Xing, Hang,et al."NMR investigation on micellization of ammonium/tetraalkylammonium perfluorooctanoates".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 318.1-3(2008):199-205.
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