Widom Lines in Binary Mixtures of Supercritical Fluids

Abstract Recent experiments on pure fluids have identified distinct liquid-like and gas-like regimes even under supercritical conditions. The supercritical liquid-gas transition is marked by maxima in response functions that define a line emanating from the critical point, referred to as Widom line....

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Autores principales:	Muralikrishna Raju, Daniel T. Banuti, Peter C. Ma, Matthias Ihme
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4413b805afa2422aa236c5c9bf651006
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spelling	oai:doaj.org-article:4413b805afa2422aa236c5c9bf6510062021-12-02T12:30:35ZWidom Lines in Binary Mixtures of Supercritical Fluids10.1038/s41598-017-03334-32045-2322https://doaj.org/article/4413b805afa2422aa236c5c9bf6510062017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03334-3https://doaj.org/toc/2045-2322Abstract Recent experiments on pure fluids have identified distinct liquid-like and gas-like regimes even under supercritical conditions. The supercritical liquid-gas transition is marked by maxima in response functions that define a line emanating from the critical point, referred to as Widom line. However, the structure of analogous state transitions in mixtures of supercritical fluids has not been determined, and it is not clear whether a Widom line can be identified for binary mixtures. Here, we present first evidence for the existence of multiple Widom lines in binary mixtures from molecular dynamics simulations. By considering mixtures of noble gases, we show that, depending on the phase behavior, mixtures transition from a liquid-like to a gas-like regime via distinctly different pathways, leading to phase relationships of surprising complexity and variety. Specifically, we show that miscible binary mixtures have behavior analogous to a pure fluid and the supercritical state space is characterized by a single liquid-gas transition. In contrast, immiscible binary mixture undergo a phase separation in which the clusters transition separately at different temperatures, resulting in multiple distinct Widom lines. The presence of this unique transition behavior emphasizes the complexity of the supercritical state to be expected in high-order mixtures of practical relevance.Muralikrishna RajuDaniel T. BanutiPeter C. MaMatthias IhmeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Muralikrishna Raju Daniel T. Banuti Peter C. Ma Matthias Ihme Widom Lines in Binary Mixtures of Supercritical Fluids
description	Abstract Recent experiments on pure fluids have identified distinct liquid-like and gas-like regimes even under supercritical conditions. The supercritical liquid-gas transition is marked by maxima in response functions that define a line emanating from the critical point, referred to as Widom line. However, the structure of analogous state transitions in mixtures of supercritical fluids has not been determined, and it is not clear whether a Widom line can be identified for binary mixtures. Here, we present first evidence for the existence of multiple Widom lines in binary mixtures from molecular dynamics simulations. By considering mixtures of noble gases, we show that, depending on the phase behavior, mixtures transition from a liquid-like to a gas-like regime via distinctly different pathways, leading to phase relationships of surprising complexity and variety. Specifically, we show that miscible binary mixtures have behavior analogous to a pure fluid and the supercritical state space is characterized by a single liquid-gas transition. In contrast, immiscible binary mixture undergo a phase separation in which the clusters transition separately at different temperatures, resulting in multiple distinct Widom lines. The presence of this unique transition behavior emphasizes the complexity of the supercritical state to be expected in high-order mixtures of practical relevance.
format	article
author	Muralikrishna Raju Daniel T. Banuti Peter C. Ma Matthias Ihme
author_facet	Muralikrishna Raju Daniel T. Banuti Peter C. Ma Matthias Ihme
author_sort	Muralikrishna Raju
title	Widom Lines in Binary Mixtures of Supercritical Fluids
title_short	Widom Lines in Binary Mixtures of Supercritical Fluids
title_full	Widom Lines in Binary Mixtures of Supercritical Fluids
title_fullStr	Widom Lines in Binary Mixtures of Supercritical Fluids
title_full_unstemmed	Widom Lines in Binary Mixtures of Supercritical Fluids
title_sort	widom lines in binary mixtures of supercritical fluids
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/4413b805afa2422aa236c5c9bf651006
work_keys_str_mv	AT muralikrishnaraju widomlinesinbinarymixturesofsupercriticalfluids AT danieltbanuti widomlinesinbinarymixturesofsupercriticalfluids AT petercma widomlinesinbinarymixturesofsupercriticalfluids AT matthiasihme widomlinesinbinarymixturesofsupercriticalfluids
_version_	1718394329587777536

Widom Lines in Binary Mixtures of Supercritical Fluids

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