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Crossover between liquid-like and gas-like behaviour in CH4 at 400 K

Smith, D; Hakeem, M; Parisiades, P; Maynard-Casely, HE; Foster, D; Eden, D; Bull, DJ; Marshall, ARL; Adawi, AM; Howie, R; Sapelkin, A; Brazhkin, VV; Proctor, JE

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Authors

D Smith

M Hakeem

P Parisiades

HE Maynard-Casely

D Foster

D Eden

DJ Bull

ARL Marshall

AM Adawi

R Howie

A Sapelkin

VV Brazhkin



Abstract

We report experimental evidence for a crossover between a liquid-like state and a gas-like state in fluid methane (CH4). This crossover is observed in all of our experiments, up to 397 K temperature; 2.1 times the critical temperature of methane. The crossover has been characterized with both Raman spectroscopy and X-ray diffraction in a number of separate experiments, and confirmed to be reversible. We associate this crossover with the Frenkel line - a recently hypothesized crossover in dynamic properties of fluids extending to arbitrarily high pressure and temperature, dividing the phase diagram into separate regions where the fluid possesses liquid-like and gas-like properties. On the liquid-like side the Raman-active vibration increases in frequency linearly as pressure is increased, as expected due to the repulsive interaction between adjacent molecules. On the gas-like side this competes with the attractive Van der Waal’s potential leading the vibration frequency to decrease as pressure is increased.

Citation

Smith, D., Hakeem, M., Parisiades, P., Maynard-Casely, H., Foster, D., Eden, D., …Proctor, J. (2017). Crossover between liquid-like and gas-like behaviour in CH4 at 400 K. Physical Review E, 96(5), 052113. https://doi.org/10.1103/PhysRevE.96.052113

Journal Article Type Article
Acceptance Date Oct 12, 2017
Publication Date Nov 9, 2017
Deposit Date Oct 23, 2017
Publicly Available Date Nov 20, 2017
Journal Physical Review E (PRE)
Print ISSN 2470-0045
Electronic ISSN 2470-0053
Publisher American Physical Society
Volume 96
Issue 5
Pages 052113
DOI https://doi.org/10.1103/PhysRevE.96.052113
Publisher URL http://dx.doi.org/10.1103/PhysRevE.96.052113
Related Public URLs https://journals.aps.org/pre/

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