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Phase Behavior and Phase Structure of a Cationic Fluorosurfactant in Water
Umeå University, Faculty of Science and Technology, Chemistry.
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2000 (English)In: Langmuir, Vol. 16, no 3, p. 1042-9Article in journal (Refereed) Published
Abstract [en]

The phase behavior of the cationic fluorocarbon surfactant 1,1,2,2-tetrahydroperfluorodecylpyridinium chloride in water has been studied using small-angle X-ray and 2H NMR spectroscopy as the main techniques. The following phase sequence was found: micellar (L1), hexagonal (HI), centered rectangular (R; spacegroup c2mm) and centered trigonal (T, spacegroup Rm) with increasing surfactant concentration. At higher concentrations evidence for random mesh phase and a lamellar phase was found, at high temperatures a bicontinuous cubic phase was found. Compared to a cationic hydrocarbon surfactant of similar hydrophobicity, the occurrence of the intermediate phases is more extensive in the phase diagram, and the fluorocarbon surfactant prefers to form intermediate phases instead of a cubic phase. The surface curvature of the aggregates changes from highly curved cylindrical structures of the hexagonal phase to the planar bilayer structure of the lamellar phase over a sequence of geometries that allow the average of the mean curvature to change gradually as water content is decreased.

Place, publisher, year, edition, pages
2000. Vol. 16, no 3, p. 1042-9
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URN: urn:nbn:se:umu:diva-8634DOI: doi:10.1021/la9909603OAI: oai:DiVA.org:umu-8634DiVA, id: diva2:148305
Available from: 2008-02-01 Created: 2008-02-01 Last updated: 2011-01-14Bibliographically approved

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