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

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Published on: March 10, 2023

Elastically driven intermittent microscopic dynamics in soft solids.

Mehdi Bouzid¹, Jader Colombo¹, Lucas Vieira Barbosa^1,2

¹Department of Physics, Institute for Soft Matter Synthesis and Metrology, Georgetown University, 37th and O Streets, N.W., Washington District Of Columbia 20057, USA.

Nature Communications

|June 22, 2017

Summary

This summary is machine-generated.

Soft solids age due to stress relaxation dynamics. Intermittent, elastically driven fluctuations, not just thermal ones, cause faster-than-exponential aging in materials, impacting their long-term performance.

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Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Published on: April 25, 2019

Area of Science:

Materials Science
Soft Matter Physics
Computational Modeling

Background:

Soft solids with tunable mechanical properties are crucial for new technologies.
Material aging significantly limits the application lifespan of soft solids.
Existing theories attribute aging to slow, gradual microscopic dynamics.

Purpose of the Study:

To investigate the microscopic origins of aging dynamics in soft solids.
To challenge the traditional paradigm of gradual aging.
To explore the role of different relaxation timescales in material aging.

Main Methods:

Utilized 3D computer simulations of a microscopic model.
Analyzed timescales of stress relaxation via thermal fluctuations.
Investigated elastically driven fluctuations and their correlations.

Main Results:

Identified distinct timescales for thermal and elastic stress relaxation.
Demonstrated that weak thermal fluctuations lead to elastically driven relaxation.
Observed intermittent dynamics and faster-than-exponential aging due to strong correlations.

Conclusions:

Aging in soft solids is governed by the interplay between thermal and elastic relaxation timescales.
Elastically driven fluctuations, particularly when thermal fluctuations are weak, drive intermittent aging.
The findings challenge conventional understanding and explain observed faster-than-exponential dynamics in soft materials.