Shephard, JJ;
Salzmann, CG;
(2016)
Molecular Reorientation Dynamics Govern the Glass Transitions of the Amorphous Ices.
The Journal of Physical Chemistry Letters
, 7
(12)
pp. 2281-2285.
10.1021/acs.jpclett.6b00881.
Text
glass transition JPCL_4.docx - Accepted Version Download (2MB) |
Abstract
The glass transitions of low-density amorphous ice (LDA) and high-density amorphous ice (HDA) are the topic of controversial discussions. Understanding their exact nature may be the key to explaining the anomalies of liquid water but has also got implications in the general context of polyamorphism, the occurrence of multiple amorphous forms of the same material. We first show that the glass transition of hydrogen-disordered ice VI is associated with the kinetic unfreezing of molecular reorientation dynamics by measuring the calorimetric responses of the corresponding H2O, H218O, and D2O materials in combination with X-ray diffraction. Well-relaxed LDA and HDA show identical isotopic-response patterns in calorimetry as ice VI, and we conclude that the glass transitions of the amorphous ices are also governed by molecular reorientation processes. This “reorientation scenario” seems to resolve the previously conflicting viewpoints and is consistent with the fragile-to-strong transition from water to the amorphous ices.
Type: | Article |
---|---|
Title: | Molecular Reorientation Dynamics Govern the Glass Transitions of the Amorphous Ices |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1021/acs.jpclett.6b00881 |
Publisher version: | http://doi.org/10.1021/acs.jpclett.6b00881 |
Language: | English |
Additional information: | Copyright © 2016 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/ipdf/10.1021/acs.jpclett.6b00881 |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
URI: | https://discovery.ucl.ac.uk/id/eprint/1503661 |
1. | China | 4 |
2. | Russian Federation | 1 |
3. | Myanmar | 1 |
Archive Staff Only
View Item |