Hauptseite > Publikationsdatenbank > Structure and dynamics of water in nonionic reverse micelles: A combined time-resolved infrared and small angle x-ray scattering study > print

001     22197
005     20240619083348.0
024 7 _ |2 pmid
|a pmid:22852627
024 7 _ |2 DOI
|a 10.1063/1.4736562
024 7 _ |2 WOS
|a WOS:000307611500038
024 7 _ |2 Handle
|a 2128/7517
037 _ _ |a PreJuSER-22197
041 _ _ |a eng
082 _ _ |a 540
084 _ _ |2 WoS
|a Physics, Atomic, Molecular & Chemical
100 1 _ |0 P:(DE-HGF)0
|a van der Loop, T.H.
|b 0
245 _ _ |a Structure and dynamics of water in nonionic reverse micelles: A combined time-resolved infrared and small angle x-ray scattering study
260 _ _ |a Melville, NY
|b American Institute of Physics
|c 2012
300 _ _ |a 044503
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400 1 _ |a Loop, T.H.
440 _ 0 |0 3145
|a Journal of Chemical Physics
|v 137
|x 0021-9606
|y 4
500 _ _ |a 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.
520 _ _ |a 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.
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|a Zhang, J.
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|g Vol. 137, p. 044503
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856 7 _ |u http://dx.doi.org/10.1063/1.4736562
856 4 _ |u https://juser.fz-juelich.de/record/22197/files/FZJ-22197.pdf
|y Published under German "Allianz" Licensing conditions on 2012-07-26. Available in OpenAccess from 2012-07-26
|z Published final document.
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