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

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › 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.

Originalsprog	Engelsk
Artikelnummer	055501
Tidsskrift	Physical Review Letters
Vol/bind	122
Udgave nummer	5
ISSN	0031-9007
DOI	https://doi.org/10.1103/PhysRevLett.122.055501
Status	Udgivet - 8 feb. 2019

Link til dokument

10.1103/PhysRevLett.122.055501Licens: CC BY

Experimental Evidence for a State-Point-Dependent Density-Scaling Exponent of Liquid DynamicsForlagets udgivne version, 308 KBLicens: CC BY

Andre filer og links

fuldtekstversion

Citer dette

@article{98fdb3478d0d46668d408384a514b7f5,

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",

month = feb,

day = "8",

doi = "10.1103/PhysRevLett.122.055501",

language = "English",

volume = "122",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "5",

}

TY - JOUR

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

SN - 0031-9007

VL - 122

JO - Physical Review Letters

JF - Physical Review Letters

IS - 5

M1 - 055501

ER -