Structural characterization of water/ice formation in SBA-15 silicas: III. The triplet profile for 86 angstrom pore diameter

Seyed-Yazdi, J. and Farman, H. and Dore, J.C. and Webber, J.B.W. and Findenegg, G.H. (2008) Structural characterization of water/ice formation in SBA-15 silicas: III. The triplet profile for 86 angstrom pore diameter. Journal of Physics-condensed Matter, 20 (20). ISSN 0953-8984. (Access to this publication is restricted)

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Abstract

The diffraction results for the formation of ice in 86 angstrom diameter pores of a SBA-15 silica sample are analysed to provide information on the characteristics of the ice created in the pores. The asymmetric triplet at similar to 1.7 angstrom(-1) which involves several overlapping peaks, is particularly relevant to the different ice phases and contains a number of components that can be individually identified. The use of a set of three peaks with an asymmetric profile to represent the possibility of facetted growth in the pores was found to give an unsatisfactory fit to the data. The alternative method involving the introduction of additional peaks with a normal symmetric profile was found to give excellent fits with five components and was the preferred analytic procedure. Three peaks could be directly linked to the positions for the triplet of hexagonal ice, I-h, and one of the other two broad peaks could be associated with a form of amorphous ice. The variation of the peak intensity (and position) was systematic with temperature for both cooling and heating runs. The results indicate that a disordered state of ice is formed as a component with the defective crystalline ices. The position of a broad diffraction peak is intermediate between that of high-density and low-density amorphous ice. The remaining component peak is less broad but does not relate directly to any of the known ice phases and cannot be assigned to any specific structural feature at the present time.

Item Type: Article
Additional information: 11th International Conference on Magnetic Fluids Kosice, Slovakia, Jul 23-27, 2007
Subjects: Q Science > QC Physics
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: J.B.W. Webber
Date Deposited: 26 Mar 2009 10:22
Last Modified: 06 Sep 2011 01:07
Resource URI: http://kar.kent.ac.uk/id/eprint/13468 (The current URI for this page, for reference purposes)
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