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Glass Transitions in Pressure-Collapsed Ice Clathrates and Implications for Cold Water
Umeå University, Faculty of Science and Technology, Department of Physics.
Research Center for Structural Thermodynamics, Graduate School of Science, Osaka University, Japan.
2012 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, Vol. 3, no 15, 1951-1955 p.Article in journal (Refereed) Published
Abstract [en]

Ice is known to collapse to amorphous ice upon pressurization at low temperatures and shows the unusual feature of multiple distinct solid amorphous water states, which have inspired models of liquid water’s structure and unusual properties.Here, we use heat capacity Cp measurements to show that similarly collapsed ice clathrates display identical glass behavior as amorphous ice but that crystallization above the glass transition temperature Tg of ∼140 K at 1 GPa is inhibited. This effect of the homogeneously distributed “guest molecules” in water reveals a relatively strong reversible Cp increase above Tg but no further transition before crystallization at ∼190 K.This is consistent with a glass−liquid transition of water at Tg, which suggests a new path to study an ultraviscous liquid water network and evaluate water models

Place, publisher, year, edition, pages
Washington: American Chemical Society (ACS), 2012. Vol. 3, no 15, 1951-1955 p.
Keyword [en]
water, glass transition, clathrate hydrate, pressure collapse
National Category
Natural Sciences
URN: urn:nbn:se:umu:diva-59597DOI: 10.1021/jz300784hISI: 000309691500004OAI: diva2:553341
Available from: 2012-09-18 Created: 2012-09-18 Last updated: 2012-11-16Bibliographically approved

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