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@ARTICLE{Malfait:477126,
author = {Malfait, Benjamin and Moréac, Alain and Jani, Aïcha and
Lefort, Ronan and Huber, Patrick and Fröba, Michael and
Morineau, Denis},
title = {{S}tructure of {W}ater at {H}ydrophilic and {H}ydrophobic
{I}nterfaces: {R}aman {S}pectroscopy of {W}ater {C}onfined
in {P}eriodic {M}esoporous ({O}rgano){S}ilicas},
journal = {The journal of physical chemistry / C},
volume = {126},
number = {7},
issn = {1932-7447},
address = {Washington, DC},
publisher = {Soc.},
reportid = {PUBDB-2022-01922},
pages = {3520 - 3531},
year = {2022},
note = {Waiting for fulltext},
abstract = {The temperature dependence of the structure of water
confined in hydrophilic mesostructured porous silica
(MCM-41) and hydrophobic benzene-bridged periodic mesoporous
organosilicas (PMOs) is studied by Raman vibrational
spectroscopy. For capillary filled pores $(75\%$ relative
humidity, RH), the OH stretching region is dominated by the
contribution from liquid water situated in the core part of
the pore. It adopts a bulklike structure that is modestly
disrupted by confinement and surface hydrophobicity. For
partially filled pores $(33\%$ RH), the structure of the
nonfreezable adsorbed film radically differs from that found
in capillary filled pores. A first remarkable feature is the
absence of the Raman spectral fingerprint of low-density
amorphous ice, even at a low temperature (−120 °C).
Second, additional bands reveal water hydroxyl groups
pointing toward the different water/solid and water/vapor
interfaces. For MCM-41, they correspond to water molecules
acting as weak H-bond donors with silica and dangling
hydroxyl groups oriented toward the empty center of the
pore. For benzene-bridged PMO, we found an additional type
of dangling hydroxyl groups, which we attribute to water at
the hydrophobic solid interface.},
cin = {CIMMS / TUHH},
ddc = {530},
cid = {I:(DE-H253)CIMMS-20211022 / I:(DE-H253)TUHH-20210331},
pnm = {631 - Matter – Dynamics, Mechanisms and Control
(POF4-631)},
pid = {G:(DE-HGF)POF4-631},
experiment = {EXP:(DE-MLZ)NOSPEC-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000766230000022},
doi = {10.1021/acs.jpcc.1c09801},
url = {https://bib-pubdb1.desy.de/record/477126},
}