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arXiv · 1305.4817

Two measures of isochronal superposition

Lisa Anita Roed·Ditte Gundermann·Jeppe C. Dyre·Kristine Niss
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Abstract

A liquid obeys isochronal superposition if its dynamics is invariant along the isochrones in the thermodynamic phase diagram (the curves of constant relaxation time). This paper introduces two quantitative measures of isochronal superposition. The measures are used to test the following six liquids for isochronal superposition: 1,2,6 hexanetriol, glycerol, polyphenyl ether, diethyl phthalate, tetramethyl tetraphenyl trisiloxane, and dibutyl phthalate. The latter four van der Waals liquids obey isochronal superposition to a higher degree than the two hydrogen-bonded liquids. This is a predic- tion of the isomorph theory, and it confirms findings by other groups.

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Lisa Anita Roed, Ditte Gundermann, Jeppe C. Dyre, Kristine Niss. 2013-09-16. Two measures of isochronal superposition. https://doi.org/10.1063/1.4821163

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