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Murine Isolated Heart Model of Myocardial Stunning Associated with Cardioplegic Arrest

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Published on: August 6, 2015

Minimal model for kinetic arrest.

P Pal¹, C S O'Hern, J Blawzdziewicz

¹Department of Mechanical Engineering, Yale University, New Haven, Connecticut 06520-8286, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|September 4, 2008

Summary

This summary is machine-generated.

We introduce a figure-8 model to study slow dynamics in glassy materials. Long-time diffusion depends on rare particle rearrangements, not just transition state volumes.

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Area of Science:

Physics
Materials Science
Statistical Mechanics

Background:

Glassy materials exhibit slow dynamics and kinetic arrest.
Understanding particle rearrangements is key to explaining cage-breaking dynamics.

Purpose of the Study:

To elucidate slow dynamics in glassy materials using a novel model.
To investigate the factors controlling long-time diffusion and structural relaxation.

Main Methods:

Introduction of the figure-8 model with N hard blocks undergoing Brownian motion.
Analysis of kinetic arrest at a critical packing fraction (phi_g).
Examination of long-time diffusion controlled by "junction-crossing" particle rearrangements.

Main Results:

The system exhibits kinetic arrest at phi_g < 1.
Long-time diffusion near phi_g is governed by rare, cooperative particle rearrangements.
The time between junction crossings (tau_JC) depends on both transition state volume and crossing time.

Conclusions:

The figure-8 model provides insights into slow dynamics in glasses.
Structural relaxation time is influenced by more than just configurational volume.
Results highlight the importance of cage-breaking dynamics in glassy systems.