TY - JOUR
T1 - Long-time structural relaxation of glass-forming liquids
T2 - Simple or stretched exponential?
AU - Niss, Kristine
AU - Dyre, Jeppe
AU - Hecksher, Tina
N1 - This article has been found as a ’Free Version’ from the Publisher on May 28, 2020. When access to the article closes, please notify [email protected]
PY - 2020/1/27
Y1 - 2020/1/27
N2 - 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.
AB - 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.
UR - http://glass.ruc.dk/pdf/articles/2020_JChemPhys_152_041103.pdf
UR - https://aip.scitation.org/doi/pdf/10.1063/1.5142189
U2 - 10.1063/1.5142189
DO - 10.1063/1.5142189
M3 - Journal article
SN - 0021-9606
VL - 152
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
IS - 4
M1 - 041103
ER -