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Related Experiment Video

Updated: Dec 30, 2025

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Self-diffusion in plastic flow of amorphous solids.

Kamran Karimi¹

¹Department of Physics and Astronomy, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4.

Physical Review. E

|January 23, 2020

Summary

Avalanche dynamics in sheared amorphous solids significantly impact tracer particle diffusion. This study reveals strong size effects in diffusion coefficients, linked to avalanche behavior in dense, slow flow.

Area of Science:

Condensed Matter Physics
Materials Science
Computational Mechanics

Background:

Sheared amorphous solids exhibit complex flow behavior governed by collective particle rearrangements.
Plastic deformation in these materials is associated with critical fluctuations and avalanche-like events.
Understanding particle-level dynamics is crucial for predicting macroscopic material properties.

Purpose of the Study:

To investigate the influence of avalanche dynamics on self-diffusion in sheared amorphous solids.
To explore the relationship between plastic events and the Fickian diffusion of tracer particles.
To identify and rationalize emergent size effects in the effective diffusion coefficient.

Main Methods:

Particle-based numerical simulations of amorphous solids under shear.

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

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Published on: September 26, 2016

The Diffusion of Passive Tracers in Laminar Shear Flow

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Analysis of critical fluctuation patterns and collective slip events.

Tracking of tracer particles to quantify self-diffusion in the Fickian regime.

Main Results:

Avalanche-type dynamics between plastic events strongly influence tracer particle self-diffusion.
A direct correlation was found between avalanche characteristics and particle diffusion rates.
Significant size effects were observed in the effective diffusion coefficient.

Conclusions:

The study demonstrates the critical role of avalanche dynamics in governing transport phenomena in amorphous solids.
Effective diffusion coefficients are directly rationalized by avalanche size distributions and temporal occurrence.
Findings provide insights into the interplay between plasticity and diffusion in disordered materials.