Wednesday, May 22, 2013

1305.4817 (Lisa Anita Roed et al.)

Quantitative Measures of Isochronal Superposition - Tested for Six

Lisa Anita Roed, Ditte Gundermann, Jeppe C. Dyre, Kristine Niss
Isochrones are curves in the thermodynamic phase diagram of a liquid along which all points have the same relaxation time. A liquid obeys isochronal superposition if its dynamics is the same along the isochrones. In this article we introduce 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. We conclude that the hydrogen-bonded liquids do not obey isochronal superposition, wheresas the van der Waals bonded liquids do. This confirms previous findings by other groups, as well as a prediction of the isomorph theory.
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