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Title: Revealing the mechanism of the viscous-to-elastic crossover in liquids

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [1];  [2];  [3];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Volgograd State Technical Univ. (Russia)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)

In our work, we report on inelastic X-ray scattering experiments combined with the molecular dynamics simulations on deeply supercritical Ar. Our results unveil the mechanism and regimes of sound propagation in the liquid matter and provide compelling evidence for the adiabatic-to-isothermal longitudinal sound propagation transition. We introduce a Hamiltonian predicting low-frequency transverse sound propagation gaps, which is confirmed by experimental findings and molecular dynamics calculations. As a result, a universal link is established between the positive sound dispersion (PSD) phenomenon and the origin of transverse sound propagation revealing the viscous-to-elastic crossover in liquids. The PSD and transverse phononic excitations evolve consistently with theoretical predictions. Both can be considered as a universal fingerprint of the dynamic response of a liquid, which is also observable in a subdomain of supercritical phase. Furthermore, the simultaneous disappearance of both these effects at elevated temperatures is a manifestation of the Frenkel line. We expect that these findings will advance the current understanding of fluids under extreme thermodynamic conditions.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC00112704
OSTI ID:
1237164
Report Number(s):
BNL-108218-2015-JA; R&D Project: LS001
Journal Information:
Journal of Physical Chemistry Letters, Vol. 6, Issue 15; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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Cited By (13)

Instantaneous shear modulus of Yukawa fluids across coupling regimes journal February 2020
Continuum mechanics with torsion journal April 2019
Revealing the mechanism of passive transport in lipid bilayers via phonon-mediated nanometre-scale density fluctuations journal May 2016
Continuum mechanics and thermodynamics in the Hamilton and the Godunov-type formulations journal January 2018
Mechanical heterogeneity in ionic liquids journal May 2018
A Unified Hyperbolic Formulation for Viscous Fluids and Elastoplastic Solids book January 2018
Onset of transverse (shear) waves in strongly-coupled Yukawa fluids journal March 2019
Thermally triggered phononic gaps in liquids at THz scale journal January 2016
Continuum mechanics with torsion text January 2018
Instantaneous shear modulus of Yukawa fluids across coupling regimes text January 2020
High order ADER schemes for a unified first order hyperbolic formulation of continuum mechanics: Viscous heat-conducting fluids and elastic solids journal June 2016
Functional lipid pairs as building blocks of phase-separated membranes journal February 2020
A unified hyperbolic formulation for viscous fluids and elastoplastic solids text January 2017

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