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Title: The Frenkel Line: a direct experimental evidence for the new thermodynamic boundary

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep15850· OSTI ID:1235468
 [1];  [1];  [2];  [3];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  2. Volgograd State Technical Univ., Volgograd (Russia)
  3. Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)

We report that supercritical fluids play a significant role in elucidating fundamental aspects of liquid matter under extreme conditions. They have been extensively studied at pressures and temperatures relevant to various industrial applications. However, much less is known about the structural behaviour of supercritical fluids and no structural crossovers have been observed in static compression experiments in any temperature and pressure ranges beyond the critical point. The structure of supercritical state is currently perceived to be uniform everywhere on the pressure-temperature phase diagram, and to change only in a monotonic way even moving around the critical point, not only along isotherms or isobars. Conversely, we observe structural crossovers for the first time in a deeply supercritical sample through diffraction measurements in a diamond anvil cell and discover a new thermodynamic boundary on the pressure-temperature diagram. We explain the existence of these crossovers in the framework of the phonon theory of liquids using molecular dynamics simulations. The obtained results are of prime importance since they imply a global reconsideration of the mere essence of the supercritical phase. Furthermore, this discovery may pave the way to new unexpected applications and to the exploration of exotic behaviour of confined fluids relevant to geo- and planetary sciences.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; FG02-94ER14466; AC02-06CH11357; EAR-0622171
OSTI ID:
1235468
Journal Information:
Scientific Reports, Vol. 5, Issue 2015; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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Cited By (10)

Supercritical fluid chromatography: From science fiction to scientific fact journal June 2019
Some Early Ideas on the Metric Geometry of Thermodynamics journal April 2016
Quantumness and state boundaries hidden in supercritical helium-4: A path integral centroid molecular dynamics study journal November 2018
Some Early Ideas on the Metric Geometry of Thermodynamics text January 2016
Widom line, dynamical crossover, and percolation transition of supercritical oxygen via molecular dynamics simulations journal January 2018
String-like collective motion in the α - and β -relaxation of a coarse-grained polymer melt journal March 2018
Thermally triggered phononic gaps in liquids at THz scale journal January 2016
Anomalous scaling of flexural phonon damping in nanoresonators with confined fluid journal January 2019
Anomalous behavior of nonlinear refractive indexes of CO 2 and Xe in supercritical states journal January 2018
Supercritical fluid chromatography journal March 1992

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