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@ARTICLE{vanderLoop:22197,
author = {van der Loop, T.H. and Panman, M.R. and Lotze, S. and
Zhang, J. and Vad, T. and Bakker, H.J. and Sager, W.F.C. and
Woutersen, S.},
title = {{S}tructure and dynamics of water in nonionic reverse
micelles: {A} combined time-resolved infrared and small
angle x-ray scattering study},
journal = {The journal of chemical physics},
volume = {137},
issn = {0021-9606},
address = {Melville, NY},
publisher = {American Institute of Physics},
reportid = {PreJuSER-22197},
pages = {044503},
year = {2012},
note = {The 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.},
abstract = {We 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.},
keywords = {J (WoSType)},
cin = {ICS-3},
ddc = {540},
cid = {I:(DE-Juel1)ICS-3-20110106},
pnm = {BioSoft: Makromolekulare Systeme und biologische
Informationsverarbeitung},
pid = {G:(DE-Juel1)FUEK505},
shelfmark = {Physics, Atomic, Molecular $\&$ Chemical},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:22852627},
UT = {WOS:000307611500038},
doi = {10.1063/1.4736562},
url = {https://juser.fz-juelich.de/record/22197},
}