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

Alejandro Sanz; Tina Hecksher; Henriette Wase Hansen; Jeppe Dyre; Kristine Niss; Ulf Rørbæk Pedersen

doi:10.1103/PhysRevLett.122.055501

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

Alejandro Sanz, Tina Hecksher, Henriette Wase Hansen, Jeppe Dyre, Kristine Niss, Ulf Rørbæk Pedersen

Research output: Contribution to journal › Journal article › Research › peer-review

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 statepoint
dependent, which is confirmed by reanalyzing data for 20 metallic liquids and two model liquids.

Original language	English
Article number	055501
Journal	Physical Review Letters
Volume	122
Issue number	5
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.122.055501
Publication status	Published - 8 Feb 2019

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10.1103/PhysRevLett.122.055501Licence: CC BY

Experimental Evidence for a State-Point-Dependent Density-Scaling Exponent of Liquid DynamicsFinal published version, 308 KBLicence: CC BY

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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.",

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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

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JF - Physical Review Letters

IS - 5

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ER -

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

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