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Formation of Ultrastable Glasses via Precipitation: A Modeling Study
Ian Douglass1, Peter Harrowell1
1School of Chemistry, University of Sydney, Sydney 2006 New South Wales, Australia.
Physical Review Letters
|April 2, 2019
Summary
Precipitation from solution can create ultrastable glasses. Residual solvent, not high-energy configurations, stabilizes these amorphous materials, surpassing bulk annealing methods.
Area of Science:
- Materials Science
- Physical Chemistry
- Chemical Engineering
Background:
- Amorphous materials and glasses exhibit complex kinetic behaviors.
- Understanding glass formation and stability is crucial for material applications.
- Solvent interactions can significantly influence material properties.
Purpose of the Study:
- To model the precipitation of glass-forming solutes from solution.
- To investigate the stability of glasses formed via precipitation.
- To explore the role of plasticizing solvents in glass formation.
Main Methods:
- Utilized a lattice model for simulating precipitation kinetics.
- Incorporated surface kinetic enhancement due to plasticizing solvents.
- Compared precipitate stability with bulk annealed glasses.
Main Results:
- Precipitation yields glasses significantly more stable than bulk annealing.
- Ultrastable amorphous precipitates are dominated by residual solvent energy.
- High-energy glass configurations are less influential in precipitate stability.
Conclusions:
- Precipitation is a viable route to forming highly stable amorphous materials.
- Residual solvent plays a key role in the ultrastability of precipitated glasses.
- This approach offers an alternative to conventional glass stabilization techniques.
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