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@ARTICLE{Niebuur:867571,
author = {Niebuur, Bart-Jan and Lohstroh, Wiebke and Appavou,
Marie-Sousai and Schulte, Alfons and Papadakis, Christine
M.},
title = {{W}ater {D}ynamics in a {C}oncentrated {P}oly( {N}
-isopropylacrylamide) {S}olution at {V}ariable {P}ressure},
journal = {Macromolecules},
volume = {52},
number = {5},
issn = {1520-5835},
address = {Washington, DC},
publisher = {Soc.},
reportid = {FZJ-2019-06194},
pages = {1942 - 1954},
year = {2019},
abstract = {Using quasi-elastic neutron scattering (QENS), we study the
dynamics of water in a concentrated
poly(N-isopropylacrylamide) solution over a large
temperature range across the demixing transition at
pressures of 0.1 and 130 MPa. The QENS spectra extending in
frequency from 1 to 3 × 103 GHz and in momentum transfer
from 0.45 to 1.65 Å–1 reveal the relaxation of hydration
water as well as multiple dynamic processes in bulk water.
At the cloud point, the fraction of hydration water
decreases abruptly at 0.1 MPa, whereas at 130 MPa, it
decreases smoothly. The susceptibility spectra of hydration
water occur at lower frequencies than those of pure water
and the dependence of the relaxation times on momentum
transfer can be described by a jump-diffusion model. At a
pressure of 0.1 MPa, the hydration water remaining in the
two-phase region is more constrained than at 130 MPa. We
attribute these findings to the pressure-dependent hydration
interactions.},
cin = {JCNS-FRM-II / JCNS-1 / MLZ},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106 / I:(DE-588b)4597118-3},
pnm = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
/ 6G15 - FRM II / MLZ (POF3-6G15)},
pid = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15},
experiment = {EXP:(DE-MLZ)TOF-TOF-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000461532900005},
doi = {10.1021/acs.macromol.8b02708},
url = {https://juser.fz-juelich.de/record/867571},
}