Generalized single-parameter aging tests and their application to glycerol

TL;DR

This study applies generalized single-parameter aging tests to glycerol's dielectric response after temperature jumps, demonstrating that glycerol approximately follows single-parameter aging, including for larger and varied temperature jumps.

Contribution

The paper extends existing single-parameter aging tests to include jumps ending at different temperatures and applies them to hydrogen-bonded glycerol for the first time.

Findings

Glycerol obeys single-parameter aging to a good approximation.

The generalized tests work for larger temperature jumps.

First application of these tests to a hydrogen-bonded liquid.

Abstract

Physical aging of glycerol following temperature jumps is studied by dielectric spectroscopy at temperatures just below the glass transition temperature. The data are analyzed using two single-parameter aging tests developed by Hecksher et al. [J. Chem. Phys. 142, 241103 (2015)]. We generalize these tests to include jumps ending at different temperatures. Moreover, four times larger jumps than previously are studied. The single-parameter aging tests are here for the first time applied to a hydrogen-bonded liquid. We conclude that glycerol obeys single-parameter aging to a good approximation.