The proper structure of cubic ice confined in mesopores |
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Authors: | Morishige Kunimitsu Uematsu Hiroaki |
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Affiliation: | Department of Chemistry, Okayama University of Science, Ridai-cho I-1, Okayama 700-0005, Japan. |
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Abstract: | To examine the reason for the formation and the structure of cubic ice in a restricted space, we measured the powder x-ray diffraction patterns of cubic ice formed within the mesopores of porous silicas as a function of pore size (4-70 nm). The results strongly suggest that cubic ice formed in the mesopores does not take a cubic structure as envisaged by Konig. It may be actually composed of very small crystallites of hexagonal ice that contains a large amount of growth faults depending on the crystallite size, that is, ice with disordered stacking sequence. Suppression of crystal growth of ice in the mesopores seems to be a vital factor for the formation and the stability of cubic ice. |
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