Identity of the local and macroscopic dynamic elastic responses in supercooled 1-propanol

Peter Weigl*, Tina Hecksher, Jeppe C. Dyre, Thomas Walther, Thomas Blochowicz

*Corresponding author

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Glass-forming liquids are well known to have significant dynamic heterogeneities, leading to spatially grossly varying elastic properties throughout the system. In this paper, we compare the local elastic response of supercooled 1-propanol monitored by triplet state solvation dynamics to the macroscopic dynamic shear modulus measured by a piezo-electric gauge. The time-dependent responses are found to be identical, which means that the dynamic macroscopic shear modulus provides a good measure of the average local elastic properties. Since the macroscopic shear modulus of a dynamically inhomogeneous system in general is not just the average of the local moduli, there was no reason to expect such a result. This surprising finding not only provides constraints for models of dynamical heterogeneities in glass-forming liquids, but also allows for a fairly straightforward check on elastic models for glassy dynamics. This journal is

TidsskriftPhysical Chemistry Chemical Physics
Udgave nummer31
Sider (fra-til)16537-16541
Antal sider5
StatusUdgivet - 21 aug. 2021

Bibliografisk note

Funding Information:
This work was supported by the VILLUM Foundations Matter grant (No. 16515).

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