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Structural characterization of water and ice in mesoporous SBA-15 silicas: II. The 'almost-filled' case for 86 angstrom pore diameter

Seyed-Yazdi, J., Farman, Hossein, Dore, John C., Webber, J. Beau W., Findenegg, G.H., Hansen, Thomas (2008) Structural characterization of water and ice in mesoporous SBA-15 silicas: II. The 'almost-filled' case for 86 angstrom pore diameter. Journal of Physics: Condensed Matter, 20 (20). ISSN 0953-8984. (doi:10.1088/0953-8984/20/20/205107) (KAR id:13469)

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Neutron diffraction measurements for D2O in SBA-15 silica of pore diameter 86 angstrom have been made in a temperature range from 300 to 100 K. The pore-filling factor for the liquid phase is 0.95, resulting in an `almost-filled' sample. The nucleation and transformation of the ice phase were determined for cooling and warming cycles at two different rates. The primary nucleation event at 258 K leads to a defective form of ice-I with predominantly cubic ice features. For temperatures below the main nucleation event, the data indicate the formation of an interfacial layer of disordered water/ice that varies with temperature and is reversible. The main diffraction peak for the water phase shows similar features to those observed in earlier studies, indicating enhanced hydrogen bonding and network correlations for the confined phase as the temperature is decreased. A detailed profile analysis of the triplet peak is presented in the accompanying paper (Seyed-Yazdi et al 2008 J. Phys.: Condens. Matter 20 205108).

Item Type: Article
DOI/Identification number: 10.1088/0953-8984/20/20/205107
Additional information: 11th International Conference on Magnetic Fluids Kosice, Slovakia, July 23-27, 2007
Subjects: Q Science > QC Physics
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: J.B.W. Webber
Date Deposited: 26 Mar 2009 09:55 UTC
Last Modified: 21 Jun 2019 11:57 UTC
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