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Colloids

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

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Microscopic pathways for stress relaxation in repulsive colloidal glasses.

F Dallari¹, A Martinelli¹, F Caporaletti¹

¹Dipartimento di Fisica, Università di Trento, I-38123 Povo (Trento), Italy.

Science Advances

|March 29, 2020

Summary

Residual stresses in glassy materials influence properties like mechanical response. Researchers visualized stress-induced dynamics in colloidal glasses as mobile, flickering regions, revealing new insights into material behavior.

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Area of Science:

Materials Science
Soft Matter Physics
Rheology

Background:

Residual stresses are inherent in glassy materials, significantly altering mechanical and optical properties.
The precise mechanisms by which stress influences material dynamics, particularly particle mobility in colloidal systems, remain incompletely understood.
Existing knowledge on stress-induced particle mobility is largely qualitative.

Purpose of the Study:

To quantitatively characterize stress-induced dynamics in colloidal glasses.
To investigate the relationship between built-in stress fields and particle mobility.
To visualize and understand the nature of stress-driven motion in these systems.

Main Methods:

Utilized a specialized preparation protocol to create colloidal glasses with directional built-in stress fields.
Employed advanced imaging techniques to observe particle dynamics at the microscale.
Analyzed the spatial and temporal characteristics of stress-induced motion.

Main Results:

Identified stress-induced dynamics as collections of "flickering" mobile regions.
Determined the linear size of these mobile regions to be approximately 20 particle diameters (≈2 μm).
Observed cooperative movement of these regions, exhibiting stationary overall dynamics with locally ballistic motion.

Conclusions:

Demonstrated that residual stress can be a primary control parameter for material dynamics in colloidal glasses.
Provided a visual and quantitative understanding of stress-induced particle mobility.
Opened avenues for exploiting stress fields to manipulate material properties and behavior.