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000022197 084__ $$2WoS$$aPhysics, Atomic, Molecular & Chemical
000022197 1001_ $$0P:(DE-HGF)0$$avan der Loop, T.H.$$b0
000022197 245__ $$aStructure and dynamics of water in nonionic reverse micelles: A combined time-resolved infrared and small angle x-ray scattering study
000022197 260__ $$aMelville, NY$$bAmerican Institute of Physics$$c2012
000022197 300__ $$a044503
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000022197 4001_ $$aLoop, T.H.
000022197 440_0 $$03145$$aJournal of Chemical Physics$$v137$$x0021-9606$$y4
000022197 500__ $$aThe authors would like to thank Stichting voor Fundamenteel Onderzoek der Materie (FOM) for financial support and Dr. P. Konarev (EMBL-Hamburg) for assistance in performing the SAXS experiments.
000022197 520__ $$aWe study the structure and reorientation dynamics of nanometer-sized water droplets inside nonionic reverse micelles (water/Igepal-CO-520/cyclohexane) with time-resolved mid-infrared pump-probe spectroscopy and small angle x-ray scattering. In the time-resolved experiments, we probe the vibrational and orientational dynamics of the O-D bonds of dilute HDO:H(2)O mixtures in Igepal reverse micelles as a function of temperature and micelle size. We find that even small micelles contain a large fraction of water that reorients at the same rate as water in the bulk, which indicates that the polyethylene oxide chains of the surfactant do not penetrate into the water volume. We also observe that the confinement affects the reorientation dynamics of only the first hydration layer. From the temperature dependent surface-water dynamics, we estimate an activation enthalpy for reorientation of 45 ± 9 kJ mol(-1) (11 ± 2 kcal mol(-1)), which is close to the activation energy of the reorientation of water molecules in ice.
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000022197 7001_ $$0P:(DE-HGF)0$$aPanman, M.R.$$b1
000022197 7001_ $$0P:(DE-HGF)0$$aLotze, S.$$b2
000022197 7001_ $$0P:(DE-Juel1)131058$$aZhang, J.$$b3$$uFZJ
000022197 7001_ $$0P:(DE-HGF)0$$aVad, T.$$b4
000022197 7001_ $$0P:(DE-HGF)0$$aBakker, H.J.$$b5
000022197 7001_ $$0P:(DE-Juel1)VDB96915$$aSager, W.F.C.$$b6$$uFZJ
000022197 7001_ $$0P:(DE-HGF)0$$aWoutersen, S.$$b7
000022197 773__ $$0PERI:(DE-600)1473050-9$$a10.1063/1.4736562$$gVol. 137, p. 044503$$p044503$$q137<044503$$tThe @journal of chemical physics$$v137$$x0021-9606$$y2012
000022197 8567_ $$uhttp://dx.doi.org/10.1063/1.4736562
000022197 8564_ $$uhttps://juser.fz-juelich.de/record/22197/files/FZJ-22197.pdf$$yPublished under German "Allianz" Licensing conditions on 2012-07-26. Available in OpenAccess from 2012-07-26$$zPublished final document.
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