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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

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Published on: January 26, 2016

Dynamical heterogeneity in lattice glass models.

Richard K Darst¹, David R Reichman, Giulio Biroli

¹Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, USA.

The Journal of Chemical Physics

|February 2, 2010

Summary

This study introduces a novel lattice glass model (LGM) exhibiting fragile glass-forming liquid properties. The model shows anisotropic particle motion and violations of the Stokes-Einstein relation, key features of dynamical heterogeneity.

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Area of Science:

Condensed Matter Physics
Materials Science
Computational Modeling

Background:

Dynamical heterogeneity is a key feature of glass-forming liquids, influencing their properties.
Lattice glass models (LGMs) offer a simplified framework to study complex glass dynamics.
Existing models may suffer from crystallization or fail to capture fragile liquid behavior.

Purpose of the Study:

To devise a novel lattice glass model (LGM) that avoids crystallization.
To investigate the properties of dynamical heterogeneity in this new LGM.
To compare LGM predictions with atomistic simulations and kinetically constrained models.

Main Methods:

Development of a new LGM with thermodynamic-based dynamical rules.
Analysis of particle motion, focusing on anisotropy and time scales.
Examination of deviations from the Stokes-Einstein relation.
Identification of length scales associated with dynamical heterogeneity.

Main Results:

The devised LGM is resistant to crystallization.
The model exhibits characteristics of a fragile glass-forming liquid.
Observed locally anisotropic particle motion despite isotropic model rules.
Demonstrated violations of the Stokes-Einstein relation and growth of heterogeneity length scales.

Conclusions:

The novel LGM successfully captures essential features of fragile glass-forming liquids.
Dynamical heterogeneity manifests as locally anisotropic motion and scale-dependent behavior.
LGMs provide a valuable theoretical tool for understanding glass physics.