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Communication

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

Department of Mathematical and Computational Sciences, Physics Science and Earth Science, University of Messina, Viale F. Stagno D’Alcontres 31, I-98166 Messina, Italy
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Academic Editor: Paola Gallo
Molecules 2021, 26(19), 5899; https://doi.org/10.3390/molecules26195899
Received: 3 September 2021 / Revised: 23 September 2021 / Accepted: 26 September 2021 / Published: 29 September 2021
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. View Full-Text
Keywords: water anomalies; extended dynamics; water diffusivity; hydrogen bonds; thermodynamic properties water anomalies; extended dynamics; water diffusivity; hydrogen bonds; thermodynamic properties
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MDPI and ACS Style

Corsaro, C.; Fazio, E. From Critical Point to Critical Point: The Two-States Model Describes Liquid Water Self-Diffusion from 623 to 126 K. Molecules 2021, 26, 5899. https://doi.org/10.3390/molecules26195899

AMA Style

Corsaro C, Fazio E. From Critical Point to Critical Point: The Two-States Model Describes Liquid Water Self-Diffusion from 623 to 126 K. Molecules. 2021; 26(19):5899. https://doi.org/10.3390/molecules26195899

Chicago/Turabian Style

Corsaro, Carmelo, and Enza Fazio. 2021. "From Critical Point to Critical Point: The Two-States Model Describes Liquid Water Self-Diffusion from 623 to 126 K" Molecules 26, no. 19: 5899. https://doi.org/10.3390/molecules26195899

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