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Order parameter profile of perfluorinated chains in a lamellar phase
KTH, Tidigare Institutioner                               , Kemi.ORCID-id: 0000-0002-6524-1441
KTH, Tidigare Institutioner                               , Kemi.ORCID-id: 0000-0002-0231-3970
2000 (engelsk)Inngår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 16, nr 6, s. 2962-2967Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Cesium perfluorooctanoate molecules are investigated by NMR spectroscopy in the lamellar phase of their aqueous solution. The particular NMR method, C-13-detected, F-19-decoupled separated-local-field (SLF) spectroscopy, provides the dipolar splitting of each C-13 spin to its F-19 neighbors. These dipolar splittings are interpreted in terms of the molecular C-F bond order parameters of each difluoromethylene and trifluoromethyl group. The obtained variation of this order parameter along the fluoroalkyl chain strengthens the conclusion from an earlier, model-dependent study (Fur6, I.; Sitnikov, R. Langmuir 1999, 15, 2669): perfluorinated surfactant chains are significantly more rigid than their hydrogenated counterparts.

sted, utgiver, år, opplag, sider
2000. Vol. 16, nr 6, s. 2962-2967
Emneord [en]
pentadecafluorooctanoate-water-system, nuclear magnetic-relaxation, h dipolar couplings, liquid-crystals, spin relaxation, nmr measurement, c-13, dynamics, resonance, anisotropy
Identifikatorer
URN: urn:nbn:se:kth:diva-19637ISI: 000085984500078OAI: oai:DiVA.org:kth-19637DiVA, id: diva2:338329
Merknad
QC 20100525Tilgjengelig fra: 2010-08-10 Laget: 2010-08-10 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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Dvinskikh, Sergey V.Furo, Istvan

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