Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.
The Glass Transition of Water, Based on Hyperquenching Experiments
V. Velikov,S. Borick,C. A. Angell*
The glass transition temperature (Tg) in
water is still uncertain, with conflicting values reported in the
literature. Aswith other hyperquenched glasses, water exhibits a large
relaxationexotherm on reheating at the normal rate of 10 kelvin (K)
perminute. This release of heat indicates the transformation of ahigh
enthalpy state to a lower one found in slow-cooled glasses.When the
exotherm temperature is scaled by Tg, the good
glass-formersshow a common pattern. However, for hyperquenched water,
whenthis analysis is performed using the commonly accepted
Tg = 136K, its behavior appears completely
different, but this shouldnot be the case because enthalpy relaxation
is fundamental tothe calorimetric glass transition. With
Tg = 165 ± 5 K, normalbehavior is
restored in comparison with other hyperquenched glassesand with the
binary solution behavior of network-former systems(H2O,
ZnCl2, or BeF2 plus a second component). This
revised valuehas relevance to the understanding of water-
biomolecule interactions.
Department of Chemistry and Biochemistry, Arizona State
University, Tempe, AZ 85287, USA.
*
To whom correspondence should be addressed. E-mail: caa{at}asu.edu
Evidence of the existence of the low-density liquid phase in supercooled, confined water.
F. Mallamace, M. Broccio, C. Corsaro, A. Faraone, D. Majolino, V. Venuti, L. Liu, C.-Y. Mou, and S.-H. Chen (2007)
PNAS
104, 424-428
|Abstract »|Full Text »|PDF »
From the Cover: The violation of the Stokes-Einstein relation in supercooled water.
S.-H. Chen, F. Mallamace, C.-Y. Mou, M. Broccio, C. Corsaro, A. Faraone, and L. Liu (2006)
PNAS
103, 12974-12978
|Abstract »|Full Text »|PDF »
Time-resolved Neutron Diffraction Studies with Emphasis on Water Ices and Gas Hydrates.
W. F. Kuhs and T. C. Hansen (2006)
Reviews in Mineralogy and Geochemistry
63, 171-204
|Full Text »|PDF »
Liquid-Like Water Confined in Stacks of Biological Membranes at 200 K and Its Relation to Protein Dynamics.
