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Comparing two sources of physical aging: Temperature vs electric field
Jan P Gabriel1, Ranko Richert2
1Glass and Time, IMFUFA, Department of Science and Environment, Roskilde University, 4000 Roskilde, Denmark.
The Journal of Chemical Physics
|October 25, 2023
Summary
This study reveals that both temperature and electric field induce similar physical aging dynamics in supercooled liquids above the glass transition temperature (Tg). These findings enhance our understanding of structural recovery and physical aging processes.
Area of Science:
- Materials Science
- Physical Chemistry
- Glass Transition Physics
Background:
- Physical aging describes a system's evolution towards equilibrium following changes in external parameters like temperature (T), pressure (p), or electric field (E).
- Electric fields can induce physical aging above the glass transition temperature (Tg), but its relationship to temperature-induced aging remains unexplored.
Purpose of the Study:
- To compare temperature-induced and electric field-induced physical aging dynamics.
- To investigate these phenomena in supercooled tributyl phosphate (TBP) under small perturbations.
- To relate structural recovery to collective reorientational dynamics.
Main Methods:
- Comparative analysis of temperature and electric field induced physical aging.
- Study of supercooled tributyl phosphate (TBP) dynamics.
- Dielectric relaxation measurements to observe collective reorientational dynamics.
Main Results:
- Both temperature and electric field induce highly similar structural recovery dynamics.
- The observed structural recovery dynamics closely match the collective reorientational dynamics measured by dielectric relaxation.
- Physical aging was successfully accessed and studied above the glass transition temperature (Tg).
Conclusions:
- Electric field-induced aging is a valid analogue to temperature-induced aging above Tg.
- The findings support and refine existing models of structural recovery and physical aging.
- This research expands the experimental window for aging studies above Tg, enabling easier comparison with equilibrium dynamics.
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