The glass transition of water, based on hyperquenching experiments

V. Velikov, S. Borick, Charles Angell

Research output: Contribution to journalArticle

299 Scopus citations

Abstract

The glass transition temperature (Tg) in water is still uncertain, with conflicting values reported in the literature. As with other hyperquenched glasses, water exhibits a large relaxation exotherm on reheating at the normal rate of 10 kelvin (K) per minute. This release of heat indicates the transformation of a high enthalpy state to a lower one found in slow-cooled glasses. When the exotherm temperature is scaled by Tg, the good glass-formers show a common pattern. However, for hyperquenched water, when this analysis is performed using the commonly accepted Tg = 136 K, its behavior appears completely different, but this should not be the case because enthalpy relaxation is fundamental to the calorimetric glass transition. With Tg = 165 ± 5 K, normal behavior is restored in comparison with other hyperquenched glasses and with the binary solution behavior of network-former systems (H2O, ZnCl2, or BeF2 plus asecond component). This revised value has relevance to the understanding of waterbiomolecule interactions.

Original languageEnglish (US)
Pages (from-to)2335-2338
Number of pages4
JournalScience
Volume294
Issue number5550
DOIs
StatePublished - Dec 14 2001

ASJC Scopus subject areas

  • General

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