Long-time structural relaxation of glass-forming liquids: Simple or stretched exponential?

Kristine Niss*, Jeppe Dyre, Tina Hecksher

*Corresponding author

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This paper presents data for the physical aging of the density of squalane upon both non-linear and nearly linear temperature jumps from states of thermal equilibrium. Invoking the single-parameter-aging scenario [Hecksher et al., J. Chem. Phys. 142, 241103 (2015); Proc. Natl. Acad. Sci. U. S. A. 116, 16736–16741 (2019)], the linear-response aging relaxation function is extracted from the data. Based on this, it is shown that the relaxation toward equilibrium follows a simple exponential function at long times; a stretched-exponential function provides a poor fit. This demonstrates the existence of a terminal relaxation rate for the physical aging of squalane, corresponding to an effective long-time cutoff in the spectrum of structural relaxation times.
TidsskriftJournal of Chemical Physics
Udgave nummer4
StatusUdgivet - 27 jan. 2020

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