The Unusual Micelle Micropolarity of Partially Fluorinated Gemini Surfactants Sensed by Pyrene Fluorescence
- 10 June 2006
- journal article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 22 (14), 6053-6055
- https://doi.org/10.1021/la060787s
Abstract
New gemini surfactants having two fluorocarbon chains were prepared by refluxing partially fluorinated alkyl bromide with N,N,N‘,N‘-tetramethyl-1,6-diaminohexane in acetonitrile. The partially fluorinated gemini surfactants containing a six-methylene spacer chain are easily soluble in water. The critical micelle concentrations (cmc's) were determined by various fluorescent probe methods. The hydrophobicity of a CF2 group was estimated to be 1.5 times that of a CH2 group according to the cmc values. The micelle micropolarity of a fluorocarbon gemini sensed by pyrene fluorescence was unusually high, suggesting an apparent iceberg-like environment in the location of pyrene. The significantly small micelle aggregation numbers of fluorinated gemini surfactants were ascertained by the pyrene fluorescence quenching method. The micelle ionization degree estimated by fluorescence quenching of 6-methoxy-N-(3-sulfopropyl)quinolinium (SPQ) gave tendencies similar to those of the corresponding hydrocarbon geminis.Keywords
This publication has 18 references indexed in Scilit:
- Degree of Micelle Ionization and Micellar Growth for Gemini Surfactants Detected by 6-Methoxy-N-(3-sulfopropyl)quinolinium Fluorescence QuenchingLangmuir, 2005
- Effect of D2O Solvent on the Micellization Behavior of 2-Hydroxy-1,1,2,3,3-pentahydroperfluoroundecyldiethyl-ammonium HalidesJournal of Oleo Science, 2005
- Micellar Counterion Binding Probed by Fluorescence Quenching of 6-methoxy-N-(3-sulfopropyl)quinoliniumJournal of Oleo Science, 2005
- Monolayer Behavior of NBD-Labeled Phospholipids at the Air/Water InterfaceLangmuir, 2002
- Fluorinated surfactants in bloodJournal of Fluorine Chemistry, 1994
- Time-resolved fluorescence quenching in micellar assembliesChemical Reviews, 1993
- The physicochemical properties of self-assembled surfactant aggregates as determined by some molecular spectroscopic probe techniquesThe Journal of Physical Chemistry, 1988
- Photophysical and Photochemical Processes in Micellar SystemsAngewandte Chemie, 1980
- Miscibility of fluorocarbon and hydrocarbon surfactants in micelles and liquid mixtures. Basic studies of oil repellent and fire extinguishing agentsThe Journal of Physical Chemistry, 1980
- Theory of self-assembly of hydrocarbon amphiphiles into micelles and bilayersJournal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics, 1976