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Demixing of fluorin...
Demixing of fluorinated and hydrogenated surfactants into distinct aggregates and into distinct regions within aggregates. A combined NMR, fluorescence quenching, and cryo-TEM study
- Artikel/kapitelEngelska2002
Förlag, utgivningsår, omfång ...
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2002-10-30
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American Chemical Society (ACS),2002
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printrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:kth-22067
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-22067URI
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https://doi.org/10.1021/la020579+DOI
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Språk:engelska
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Sammanfattning på:engelska
Ingår i deldatabas
Klassifikation
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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QC 20100525
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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.
Ämnesord och genrebeteckningar
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critical demicellization concentration
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cationic fluorocarbon surfactant
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tetradecyl sulfate mixture
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hydrocarbon surfactants
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mixed micelles
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sodium perfluorooctanoate
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magnetic-resonance
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f-19 nmr
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diethanolheptadecafluoro-2-undecanolmethylammonium chloride
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aqueous-solution
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Hansson, P.
(författare)
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Almgren, M.
(författare)
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Furo, IstvanKTH,Kemi(Swepub:kth)u1a9c3pb
(författare)
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KTHKemi
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Langmuir: American Chemical Society (ACS)18:24, s. 9243-92490743-74631520-5827
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