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Solute-Solvent Cont...
Solute-Solvent Contact by Intermolecular Cross Relaxation : II. The Water-Micelle Interface and the Micellar Interior
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- Nordstierna, Lars (författare)
- KTH,Fysikalisk kemi
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- Yushmanov, Pavel V. (författare)
- KTH,Fysikalisk kemi
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- Furo, Istvan (författare)
- KTH,Fysikalisk kemi
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(creator_code:org_t)
- 2006-12-07
- 2006
- Svenska.
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Ingår i: Journal of Physical Chemistry B. - : American Chemical Society (ACS). - 1520-6106 .- 1520-5207. ; 110:51, s. 25775-25781
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The intermolecular dipole-dipole cross-relaxation is measured between F-19 nuclei of sodium perfluorooctanoate in micelles and H-1 nuclei of the water solvent. The cross-relaxation rates for fluorines in the different moieties along the surfactant vary strongly by the resonance frequency in the investigated range of 188-470 MHz. This frequency dependence indicates that the cross-relaxation between water and amphiphilic aggregates is not controlled solely by the fast local water dynamics but significantly contributed to by the long-range translational diffusion of water. The cross-relaxation rates, analyzed in the framework of a model (Nordstierna, L.; Yushmanov, P. V.; Furo, I. J. Chem. Phys. 2006, 125, 074704), provide information about the dynamic retardation of water molecules by the micellar headgroup region and the location of the various moieties along the hydrophobic tail with respect to the water-micelle interface. Both intermolecular cross-relaxation and aggregation-induced F-19 chemical shift changes indicate no direct water contact to fluorines except for those closest to the head group.
Ämnesord
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
Nyckelord
- nuclear-magnetic-resonance
- overhauser effect measurements
- molecular-dynamics simulation
- ionic surfactant micelles
- order-parameter profile
- sodium dodecyl-sulfate
- spin relaxation
- magic-angle
- translational diffusion
- conformational-analysis
- Physical chemistry
- Fysikalisk kemi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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