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HERO ID
3860182
Reference Type
Journal Article
Title
EFFECT OF UREA ON MICELLE FORMATION OF FLUOROCARBON SURFACTANTS
Author(s)
Asakawa, T; Hashikawa, M; Amada, K; Miyagishi, S
Year
1995
Is Peer Reviewed?
1
Journal
Langmuir
ISSN:
0743-7463
EISSN:
1520-5827
Publisher
AMER CHEMICAL SOC
Location
WASHINGTON
Volume
11
Issue
7
Page Numbers
2376-2379
Language
English
DOI
10.1021/la00007a010
Web of Science Id
WOS:A1995RL57200011
Abstract
The effect of urea on micelle formation of fluorocarbon surfactants was investigated by measuring conductivity cmc and fluorescence intensity of probes (1-anilinonaphthalene-8-sulfonate, auramine, and pyrene). We examined various fluorocarbon surfactants which consist of different ionic head groups, i.e., lithium perfluorononanoate (LiPFN), diethylammonium perfluorononanoate (DEAPFN), lithium perfluorooctanesulfonate (LiFOS), and 1H-1H,2H,2H-perfluorodecyl sulfate (LiHFDeS). Significant differences do exist between fluorocarbon and hydrocarbon surfactants; the cmc's of the fluorocarbons slightly decreased with the addition of urea, while those of the hydrocarbons increased as reported previously. The slight decreases in cmc's of fluorocarbon surfactants were confirmed by comparison with LiDS and LiHFDeS which contain the same ionic head group. The counterion dissociation degree of micelles always increased with the addition of urea. The micropolarities of fluorocarbon micelles were almost identical with the polarity of water, and were independent of urea concentration. The microviscosities of DEAPFN micelles decreased with urea concentration. These results suggest the significant differences in micellar characteristics between fluorocarbon and hydrocarbon surfactants.
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