Structural markers of the Frenkel line in the proximity of Widom lines

Pruteanu, CG ORCID: https://orcid.org/0000-0001-6586-4115, Proctor, JE ORCID: https://orcid.org/0000-0003-3639-8295, Alderman, OLG and Loveday, JS ORCID: https://orcid.org/0000-0003-3985-9982 2021, 'Structural markers of the Frenkel line in the proximity of Widom lines' , The Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry), 125 (31) , pp. 8902-8906.

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Abstract

We have performed a neutron scattering experiment on supercritical uid nitrogen at 160 K (1.27 TC) over a wide pressure range (7.8 MPa / 0.260 g/ml to 125 MPa / 0.805 g/ml). This has enabled us to study the process by which nitrogen changes from a fluid that exhibits gas-like behaviour to one that exhibits rigid liquid-like behaviour at a temperature close to, but above, the critical temperature by crossing the Widom lines followed by the Frenkel line on pressure (density) increase. We find that the Frenkel line transition is indicated by a transition to a regime of rigid liquid-like behaviour in which the coordination number remains constant within error, in agreement with our previous work at 300 K. The Frenkel line transition takes place at approximately the same density at 160 K and 300 K. The data do not conclusively show an additional transition at the location of the known Widom lines. We find that behaviour remains gas-like until the Frenkel line is crossed and our data support the hypothesis that the Widom line transitions are density increase-driven.

Item Type: Article
Additional Information: ** From Crossref journal articles via Jisc Publications Router **Journal IDs: pissn 1520-6106; eissn 1520-5207 **History: published 12-08-2021; issued 29-07-2021; published_online 29-07-2021
Schools: Schools > School of Computing, Science and Engineering > Salford Innovation Research Centre
Journal or Publication Title: The Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry)
Publisher: ACS Publications
ISSN: 1520-6106
Related URLs:
Funders: H2020 European Research Council
SWORD Depositor: Publications Router
Depositing User: Publications Router
Date Deposited: 24 Aug 2021 08:24
Last Modified: 28 Aug 2021 10:27
URI: http://usir.salford.ac.uk/id/eprint/61659

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