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Related Experiment Video

Updated: May 7, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Fluctuating mobility generation and transport in glasses.

Apiwat Wisitsorasak¹, Peter G Wolynes

¹Center for Theoretical Biological Physics, Rice University, Houston, Texas 77005, USA and Department of Physics & Astronomy, Rice University, Houston, Texas 77005, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|September 17, 2013

Summary

Rejuvenating glasses exhibit a mobility front that grows from the surface inward, matching experimental observations. This study models spatiotemporal structures in glasses using an extended mode coupling theory.

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Area of Science:

Condensed Matter Physics
Materials Science
Statistical Mechanics

Background:

The glass transition is a complex phenomenon involving slow dynamics and structural arrest.
Understanding the rejuvenation process in glasses is crucial for predicting material behavior over time.
Spatiotemporal structures play a significant role in the dynamics of disordered systems.

Purpose of the Study:

To model the spatiotemporal structures in rejuvenating glasses using an extended mode coupling theory.
To investigate the role of activated events and facilitation effects in glass rejuvenation.
To quantitatively compare theoretical predictions with experimental data on ultrastable glass rejuvenation.

Main Methods:

Utilized an extended mode coupling theory incorporating activated events.
Numerically solved fluctuating dynamical equations for mobility and fictive temperature fields.
Developed a model that captures mobility generation and facilitation effects.

Main Results:

A growth front of high mobility originates from the glass surface during rejuvenation.
This mobility front propagates into the lower mobility bulk of the glass.
The calculated speed of the front shows quantitative agreement with experimental results on ultrastable glasses.

Conclusions:

The extended mode coupling theory successfully describes the rejuvenation dynamics of glasses.
Activated events are key to generating mobility fronts and understanding surface-initiated melting.
The model provides a framework for predicting the response of glasses to rejuvenation stimuli.