Title: Translational and rotational dynamics of water in mesoporous silica materials: MCM-41-S and MCM-48-S
Abstract: We investigated the translational and rotational dynamics of water molecules in mesoporous silica materials MCM-41-S and MCM-48-S using the incoherent quasielastic neutron scattering technique. The range of wave vector transfers Q covered in the measurements was from 0.27 to 1.93 Å−1 broad enough to detect both the translational and rotational contributions to the scattering. We used the relaxing-cage models for both translational and rotational motions which we developed earlier, to analyze the QENS spectra and investigated water dynamics in a supercooled range from 250 to 280 K. The results show a marked slowing down of both the translational and rotational relaxation times, and an increasing effect of confinement on the translational motion, as the temperature is lowered.
Publication Year: 2003
Publication Date: 2003-08-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 88
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