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Demixing of fluorinated and hydrogenated surfactants into distinct aggregates and into distinct regions within aggregates. A combined NMR, fluorescence quenching, and cryo-TEM study
KTH, Superseded Departments, Chemistry.ORCID iD: 0000-0002-0231-3970
2002 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 18, no 24, 9243-9249 p.Article in journal (Refereed) Published
Abstract [en]

The formation of two different kinds of micelles in the cationic surfactant mixture of HFDePC and CTAC as well as the increased mixing with increasing temperature has been investigated. A critical temperature of demixing was appreciated to 42 degreesC. NMR self-diffusion measurements reveal to us a coexistence of larger fluorocarbon-rich and smaller hydrocarbon-rich micelles, which is also observed using cryo-TEM. We also suggest, from F-19 line width data, that the two surfactant species constituting the demixed micelles are I'microphase-separated. The existence of such aggregates has earlier only been speculated upon. From time-resolved fluorescence quenching measurements, we have estimated the fraction of fluorocarbon surfactant in the hydrocarbon-rich micelles to larger than 0.1.

Place, publisher, year, edition, pages
2002. Vol. 18, no 24, 9243-9249 p.
Keyword [en]
critical demicellization concentration, cationic fluorocarbon surfactant, tetradecyl sulfate mixture, hydrocarbon surfactants, mixed micelles, sodium perfluorooctanoate, magnetic-resonance, f-19 nmr, diethanolheptadecafluoro-2-undecanolmethylammonium chloride, aqueous-solution
URN: urn:nbn:se:kth:diva-22067DOI: 10.1021/la020579+ISI: 000179428400020OAI: diva2:340765
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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