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Spatiotemporal structures in aging and rejuvenating glasses.

Peter G Wolynes¹

¹Departments of Physics and Chemistry and Biochemistry, Center for Theoretical Biological Physics, University of California at San Diego, La Jolla, CA 92093, USA. pwolynes@ucsd.edu

Proceedings of the National Academy of Sciences of the United States of America

|February 4, 2009

Summary

Aging and rejuvenating glasses exhibit complex structures due to mobility dynamics. Combining theories explains these changes, with rejuvenation showing flame-like fronts driven by mobility propagation.

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Area of Science:

Condensed Matter Physics
Materials Science
Glass Science

Background:

Aging and rejuvenation in glasses involve complex spatiotemporal structure development.
Understanding these structures requires analyzing the interplay between mobility generation and transport.

Purpose of the Study:

To theoretically model and explain the complex spatiotemporal structures formed during glass aging and rejuvenation.
To investigate the role of mobility generation and transport in these structural changes.

Main Methods:

Combined random first-order transition theory (RFOT) for activated events with mode coupling theory (MCT).
Applied these theories in an inhomogeneous setting to account for spatial variations.
Utilized concepts from combustion theory to analyze the propagation of enhanced mobility fronts.

Main Results:

Mobility transport has modest effects on the time course of glass aging.
Glass rejuvenation is significantly impacted by the propagation of enhanced mobility fronts, resembling flame propagation.
The speed of these rejuvenation fronts can be estimated using combustion theory principles.

Conclusions:

The interplay between activated reconfiguration events and mobility transport governs glass aging and rejuvenation structures.
Rejuvenation exhibits distinct, flame-like propagation dynamics driven by mobility fronts.
Combustion theory provides a useful framework for understanding rejuvenation fronts and diluent uptake in glasses.