Experimental Evidence for a State-Point-Dependent Density-Scaling Exponent of Liquid Dynamics

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Resumé

A large class of liquids obey density scaling characterized by an exponent, which quantifies the relative roles of temperature and density for the dynamics. We present experimental evidence that the densityscaling exponent γ is state-point dependent for the glass formers tetramethyl-tetraphenyl-trisiloxane
(DC704) and 5-polyphenyl ether (5PPE). A method is proposed that from dynamic and thermodynamic properties at equilibrium estimates the value of γ. The method applies at any state point of the pressuretemperature plane, both in the supercooled and the normal liquid regimes. We find that γ is generally statepoint
dependent, which is confirmed by reanalyzing data for 20 metallic liquids and two model liquids.
OriginalsprogEngelsk
Artikelnummer055501
TidsskriftPhysical Review Letters
Vol/bind122
Udgave nummer5
ISSN0031-9007
DOI
StatusUdgivet - 8 feb. 2019

Citer dette

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title = "Experimental Evidence for a State-Point-Dependent Density-Scaling Exponent of Liquid Dynamics",
abstract = "A large class of liquids obey density scaling characterized by an exponent, which quantifies the relative roles of temperature and density for the dynamics. We present experimental evidence that the densityscaling exponent γ is state-point dependent for the glass formers tetramethyl-tetraphenyl-trisiloxane(DC704) and 5-polyphenyl ether (5PPE). A method is proposed that from dynamic and thermodynamic properties at equilibrium estimates the value of γ. The method applies at any state point of the pressuretemperature plane, both in the supercooled and the normal liquid regimes. We find that γ is generally statepointdependent, which is confirmed by reanalyzing data for 20 metallic liquids and two model liquids.",
author = "Alejandro Sanz and Tina Hecksher and Hansen, {Henriette Wase} and Jeppe Dyre and Kristine Niss and Pedersen, {Ulf R{\o}rb{\ae}k}",
year = "2019",
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doi = "10.1103/PhysRevLett.122.055501",
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journal = "Physical Review Letters",
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T1 - Experimental Evidence for a State-Point-Dependent Density-Scaling Exponent of Liquid Dynamics

AU - Sanz, Alejandro

AU - Hecksher, Tina

AU - Hansen, Henriette Wase

AU - Dyre, Jeppe

AU - Niss, Kristine

AU - Pedersen, Ulf Rørbæk

PY - 2019/2/8

Y1 - 2019/2/8

N2 - A large class of liquids obey density scaling characterized by an exponent, which quantifies the relative roles of temperature and density for the dynamics. We present experimental evidence that the densityscaling exponent γ is state-point dependent for the glass formers tetramethyl-tetraphenyl-trisiloxane(DC704) and 5-polyphenyl ether (5PPE). A method is proposed that from dynamic and thermodynamic properties at equilibrium estimates the value of γ. The method applies at any state point of the pressuretemperature plane, both in the supercooled and the normal liquid regimes. We find that γ is generally statepointdependent, which is confirmed by reanalyzing data for 20 metallic liquids and two model liquids.

AB - A large class of liquids obey density scaling characterized by an exponent, which quantifies the relative roles of temperature and density for the dynamics. We present experimental evidence that the densityscaling exponent γ is state-point dependent for the glass formers tetramethyl-tetraphenyl-trisiloxane(DC704) and 5-polyphenyl ether (5PPE). A method is proposed that from dynamic and thermodynamic properties at equilibrium estimates the value of γ. The method applies at any state point of the pressuretemperature plane, both in the supercooled and the normal liquid regimes. We find that γ is generally statepointdependent, which is confirmed by reanalyzing data for 20 metallic liquids and two model liquids.

UR - http://glass.ruc.dk/pdf/articles/2019_Phys_Rev_Lett.%20122.pdf

U2 - 10.1103/PhysRevLett.122.055501

DO - 10.1103/PhysRevLett.122.055501

M3 - Journal article

VL - 122

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 5

M1 - 055501

ER -