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Ultrastable glasses from in silico vapour deposition
Sadanand Singh1, M D Ediger, Juan J de Pablo
1Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Nature Materials
|January 8, 2013
Summary
Researchers created ultrastable glasses using a computer simulation mimicking physical vapor deposition. These glasses exhibit properties of equilibrium supercooled liquids, offering insights into glass stability and structure.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Computational Chemistry
Background:
- Glasses are typically formed by cooling liquids, with properties influenced by thermal history.
- Vapor-deposited glasses show enhanced stability, potentially reaching equilibrium states over long aging times.
Purpose of the Study:
- To create ultrastable glasses using a computational method simulating physical vapor deposition.
- To investigate the properties and structural characteristics of these ultrastable glasses.
Main Methods:
- Computer simulations mimicking physical vapor deposition onto a substrate.
- Analysis of glass properties below the glass-transition temperature.
- Examination of structural motifs, including Voronoi polyhedra.
Main Results:
- Ultrastable glasses were successfully created, exhibiting properties of equilibrium supercooled liquids.
- Optimal stability was achieved when deposition occurred at the Kauzmann temperature.
- Extraordinary stability correlated with an abundance of regular Voronoi polyhedra and fewer irregular ones.
Conclusions:
- Computer simulations can produce ultrastable glasses with properties mirroring equilibrium states.
- The Kauzmann temperature is identified as optimal for achieving maximum glass stability.
- Specific structural features, like regular Voronoi polyhedra, are key to enhanced glass stability.
