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The Mechanics of Poro-Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton

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Multi-scale dynamics at the glassy silica surface.

Huy A Nguyen¹, Can Liao¹, Alison Wallum¹

¹Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

The Journal of Chemical Physics

|November 10, 2019

Summary

This summary is machine-generated.

Glassy silica films exhibit dynamic motions below the glass transition temperature. Clusters of silica glass-forming units (GFUs) hop and merge, while Si-O-Si bridges flip, influencing the material

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Area of Science:

Materials Science
Condensed Matter Physics
Surface Science

Background:

Silica-based glass is ubiquitous, yet its dynamics below the glass transition temperature remain debated.
Understanding these dynamics is crucial for applications ranging from insulation to microelectronics.

Purpose of the Study:

To investigate and classify atomic-scale motions in glassy silica films at room temperature.
To elucidate the nature of dynamics occurring well below the glass transition temperature (T_g).

Main Methods:

Fabrication of thin glassy silica films via Si(100) surface oxidation (0.5–1.5 nm thickness).
In situ scanning tunneling microscopy (STM) for imaging and classifying motions at room temperature.
Electronic structure calculations to assign observed vibrational fine structures.

Main Results:

Observed two distinct dynamic phenomena: cluster hopping and Si-O-Si bridge flipping.
Glass-forming units (GFUs) form clusters that exhibit cooperative hopping, merging (aging), and splitting (rejuvenation) on minute timescales.
Si-O-Si bridges within clusters flip on second timescales, creating a vibrational fine structure.
Calculated barrier heights for hopping align with thermodynamic predictions of configurational entropy.

Conclusions:

The study reveals distinct configurational and vibrational dynamics in silica glass below T_g.
Observed dynamics, including cluster hopping and GFU flipping, are consistent with thermodynamic models of the glass transition.
Both vibrational and configurational entropy contribute significantly to the dynamics on a per-GFU basis.