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Issue 25, 2020
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Density scaling of structure and dynamics of an ionic liquid

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Abstract

Room temperature ionic liquids are salts with low melting points achieved by employing bulky and asymmetrical ions. The molecular design leads to apolar and polar parts as well as the presence of competing Coulomb and van der Waals interactions giving rise to nano-scale structure, e.g. charge ordering. In this paper we address the question of how these nano-scale structures influence transport properties and dynamics on different timescales. We apply pressure and temperature as control parameters and investigate the structure factor, charge transport, microscopic alpha relaxation and phonon dynamics in the phase diagram of an ionic liquid. Including viscosity and self diffusion data from literature we find that all the dynamic and transport variables studied follow the same density scaling, i.e. they all depend on the scaling variable Γ = ργ/T, with γ = 2.8. The molecular nearest neighbor structure is found to follow a density scaling identical to that of the dynamics, while this is not the case for the charge ordering, indicating that the charge ordering has little influence on the investigated dynamics.

Graphical abstract: Density scaling of structure and dynamics of an ionic liquid

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Supplementary files

Article information


Submitted
05 Mar 2020
Accepted
31 May 2020
First published
17 Jun 2020

Phys. Chem. Chem. Phys., 2020,22, 14169-14176
Article type
Paper

Density scaling of structure and dynamics of an ionic liquid

H. W. Hansen, F. Lundin, K. Adrjanowicz, B. Frick, A. Matic and K. Niss, Phys. Chem. Chem. Phys., 2020, 22, 14169
DOI: 10.1039/D0CP01258K

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