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From Critical Point to Critical Point: The Two-States Model Describes Liquid Water Self-Diffusion from 623 to 126 K

Authors :
Carmelo Corsaro
Enza Fazio
Source :
Molecules, Vol 26, Iss 19, p 5899 (2021)
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

Liquid’s behaviour, when close to critical points, is of extreme importance both for fundamental research and industrial applications. A detailed knowledge of the structural–dynamical correlations in their proximity is still today a target to reach. Liquid water anomalies are ascribed to the presence of a second liquid–liquid critical point, which seems to be located in the very deep supercooled regime, even below 200 K and at pressure around 2 kbar. In this work, the thermal behaviour of the self-diffusion coefficient for liquid water is analyzed, in terms of a two-states model, for the first time in a very wide thermal region (126 K < T < 623 K), including those of the two critical points. Further, the corresponding configurational entropy and isobaric-specific heat have been evaluated within the same interval. The two liquid states correspond to high and low-density water local structures that play a primary role on water dynamical behavior over 500 K.

Details

Language :
English
ISSN :
14203049
Volume :
26
Issue :
19
Database :
Directory of Open Access Journals
Journal :
Molecules
Publication Type :
Academic Journal
Accession number :
edsdoj.94256773a0654aa4b847ae31c6a94a50
Document Type :
article
Full Text :
https://doi.org/10.3390/molecules26195899