Universality, Scaling, and Collapse in Supercritical Fluids

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Title
Universality, Scaling, and Collapse in Supercritical Fluids
Author
Ha, Min YoungYoon, Tae JunTlusty, TsviJho, YongSeokLee, Won Bo
Issue Date
2020-01
Publisher
American Chemical Society
Citation
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.11, no.2, pp.451 - 455
Abstract
Supercritical fluid (SCF) is known to exhibit salient dynamic and thermodynamic crossovers and an inhomogeneous molecular distribution. However, the question as to what basic physics underlies these microscopic and macroscopic anomalies remains open. Here, using an order parameter extracted by machine learning, the fraction of gas-like (or liquid-like) molecules, we find simplicity and universality in SCF: First, all isotherms of a given fluid collapse onto a single master curve described by a scaling relation. The observed power law holds from the high-temperature and -pressure regime down to the critical point where it diverges. Second, phase diagrams of different compounds collapse onto their master curves by the same scaling exponent, thereby demonstrating a putative law of corresponding supercritical states in simple fluids. The reported results support a model of the SCF as a mixture of two interchangeable microstates, whose spatiotemporal dynamics gives rise to unique macroscopic properties.
URI
https://scholarworks.unist.ac.kr/handle/201301/30771
URL
https://pubs.acs.org/doi/10.1021/acs.jpclett.9b03360
DOI
10.1021/acs.jpclett.9b03360
ISSN
1948-7185
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