Isochronal superposition and density scaling of the α-relaxation from pico- to millisecond

Henriette Wase Hansen; Bernhard Frick; Simone Capaccioli; Alejandro Sanz; Kristine Niss

doi:10.1063/1.5055665

Isochronal superposition and density scaling of the α-relaxation from pico- to millisecond

Henriette Wase Hansen, Bernhard Frick, Simone Capaccioli, Alejandro Sanz, Kristine Niss

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

Abstract

The relaxation dynamics in two van der Waals bonded liquids and one hydrogen-bonding molecular
liquid are studied as a function of pressure and temperature by incoherent neutron scattering
using simultaneous dielectric spectroscopy. The dynamics are studied in a range of alpha relaxation
times from pico- to milliseconds, primarily in the equilibrium liquid state. In this range, we find that
isochronal superposition and density scaling work not only for the two van derWaals liquids but also for
the hydrogen-bonding liquid, though the density scaling exponent is much smaller for the latter. Density
scaling and isochronal superposition are seen to break down for intra-molecular dynamics when
it is separated in time from the alpha relaxation, in close agreement with previous observations from
molecular dynamics simulations.

Originalsprog	Engelsk
Artikelnummer	214503
Tidsskrift	Journal of Chemical Physics
Vol/bind	149
Udgave nummer	21
ISSN	0021-9606
DOI	https://doi.org/10.1063/1.5055665
Status	Udgivet - 7 dec. 2018

Bibliografisk note

This article has been found as a ’Free Version’ from the Publisher on December 20 2019. When access to the article closes, please notify [email protected]

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10.1063/1.5055665

Isochronal superposition and density scalingAccepteret manuskript, 2,58 MB

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Free Version

High Pressure Cell for Simultaneous Dielectric and QENS/INS going up to 500 MPa
Niss, K. (Ophavsmand), Adrjanowicz, K. (Ophavsmand), Alba Simionesco, C. (Ophavsmand), Appel, M. (Ophavsmand), Capaccioli, S. (Ophavsmand), Frick, B. (Ophavsmand), Hansen, H. W. (Ophavsmand), Jakobsen, B. (Ophavsmand), Lelievre Berna, E. (Ophavsmand), Lundin, F. (Ophavsmand), Ollivier, J. (Ophavsmand), Paluch, M. (Ophavsmand), Peters, J. (Ophavsmand) & Sanz, A. (Ophavsmand), Institut Laue-Langevin (ILL), 2015
DOI: 10.5291/ill-data.ltp-6-7, https://doi.ill.fr/10.5291/ILL-DATA.LTP-6-7
Datasæt
The connection between fast and slow dynamics in glass-forming liquids: atest of the 'isomorph theory' of simple liquids
Niss, K. (Ophavsmand), Alba Simionesco, C. (Ophavsmand), Capaccioli, S. (Ophavsmand), Ciampalini, G. (Ophavsmand), Frick, B. (Ophavsmand), Hansen, H. W. (Ophavsmand), Peters, J. (Ophavsmand) & Alejandro, S. (Ophavsmand), Institut Laue-Langevin (ILL), 2015
DOI: 10.5291/ill-data.6-05-961, https://doi.ill.fr/10.5291/ILL-DATA.6-05-961
Datasæt

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title = "Isochronal superposition and density scaling of the α-relaxation from pico- to millisecond",

abstract = "The relaxation dynamics in two van der Waals bonded liquids and one hydrogen-bonding molecular liquid are studied as a function of pressure and temperature by incoherent neutron scattering using simultaneous dielectric spectroscopy. The dynamics are studied in a range of alpha relaxation times from pico- to milliseconds, primarily in the equilibrium liquid state. In this range, we find that isochronal superposition and density scaling work not only for the two van der Waals liquids but also for the hydrogen-bonding liquid, though the density scaling exponent is much smaller for the latter. Density scaling and isochronal superposition are seen to break down for intra-molecular dynamics when it is separated in time from the alpha relaxation, in close agreement with previous observations from molecular dynamics simulations.",

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AU - Hansen, Henriette Wase

AU - Frick, Bernhard

AU - Capaccioli, Simone

AU - Sanz, Alejandro

AU - Niss, Kristine

N1 - This article has been found as a ’Free Version’ from the Publisher on December 20 2019. When access to the article closes, please notify [email protected]

PY - 2018/12/7

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N2 - The relaxation dynamics in two van der Waals bonded liquids and one hydrogen-bonding molecular liquid are studied as a function of pressure and temperature by incoherent neutron scattering using simultaneous dielectric spectroscopy. The dynamics are studied in a range of alpha relaxation times from pico- to milliseconds, primarily in the equilibrium liquid state. In this range, we find that isochronal superposition and density scaling work not only for the two van der Waals liquids but also for the hydrogen-bonding liquid, though the density scaling exponent is much smaller for the latter. Density scaling and isochronal superposition are seen to break down for intra-molecular dynamics when it is separated in time from the alpha relaxation, in close agreement with previous observations from molecular dynamics simulations.

AB - The relaxation dynamics in two van der Waals bonded liquids and one hydrogen-bonding molecular liquid are studied as a function of pressure and temperature by incoherent neutron scattering using simultaneous dielectric spectroscopy. The dynamics are studied in a range of alpha relaxation times from pico- to milliseconds, primarily in the equilibrium liquid state. In this range, we find that isochronal superposition and density scaling work not only for the two van der Waals liquids but also for the hydrogen-bonding liquid, though the density scaling exponent is much smaller for the latter. Density scaling and isochronal superposition are seen to break down for intra-molecular dynamics when it is separated in time from the alpha relaxation, in close agreement with previous observations from molecular dynamics simulations.

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Isochronal superposition and density scaling of the α-relaxation from pico- to millisecond

Abstract

Bibliografisk note

Link til dokument

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Forskningsdatasæt

High Pressure Cell for Simultaneous Dielectric and QENS/INS going up to 500 MPa

The connection between fast and slow dynamics in glass-forming liquids: atest of the 'isomorph theory' of simple liquids

Citer dette