Publisher DOI: | 10.1021/acs.jpcc.1c09801 | Title: | Structure of water at hydrophilic and hydrophobic interfaces: raman spectroscopy of water confined in periodic mesoporous (organo)silicas | Language: | English | Authors: | Malfait, Benjamin Moreác, Alain Jani, Aicha Lefort, Ronan Huber, Patrick ![]() Fröba, Michael Morineau, Denis |
Issue Date: | 9-Feb-2022 | Publisher: | Soc. | Source: | Journal of Physical Chemistry C 126 (7): 3520-3531 (2022) | Abstract (english): | 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. |
URI: | http://hdl.handle.net/11420/11783 | ISSN: | 1932-7455 | Journal: | The journal of physical chemistry C | Institute: | Material- und Röntgenphysik M-2 | Document Type: | Article | Project: | Veränderung der Eigenschaften mehrphasiger Flüssigkeiten durch geometrische Beschränkung in modernen mesoporösen Materialien | Funded by: | Deutsche Forschungsgemeinschaft (DFG) | More Funding information: | This work was conducted in the frame of the DFG-ANR collaborative project (Project NanoLiquids No. ANR-18-CE92-0011-01, DFG Grant No. Fr 1372/25-1-Project number 407319385, and DFG Grant No. Hu850/11-1-Project number 407319385), which is acknowledged. |
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