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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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Transient dynamics in dense colloidal suspensions under shear: shear rate dependence.

M Laurati¹, K J Mutch, N Koumakis

¹Condensed Matter Physics Laboratory, IPkM, Heinrich-Heine University, 40225 Düsseldorf, Germany. marco.laurati@uni-duesseldorf.de

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|November 2, 2012

Summary

Investigating supercooled and glassy systems under shear reveals that higher shear rates intensify stress overshoots and super-diffusion. At high shear rates, systems yield more abruptly due to suppressed Brownian motion.

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Area of Science:

Materials Science
Soft Matter Physics
Computational Physics

Background:

Supercooled and glassy systems exhibit complex dynamics under shear.
Understanding their transient behavior and stress-strain relations is crucial for material design.

Purpose of the Study:

To investigate the effect of shear rate on transient dynamics and stress-strain relations in supercooled and glassy systems.
To explore the interplay between microscopic dynamics and macroscopic rheology under shear.

Main Methods:

Confocal microscopy
Rheology experiments
Brownian dynamics (BD) simulations
Molecular dynamics (MD) simulations
Mode coupling theory (MCT)

Main Results:

Increased shear rate enhances super-diffusion in microscopic dynamics and stress overshoot in macroscopic rheology.
Mode coupling theory (MCT) correlates these phenomena with negative generalized shear modulus sections that grow with shear rate.
At high shear rates (inverse shear rate much smaller than relaxation time), Brownian motion becomes less significant, leading to earlier and more abrupt yielding.

Conclusions:

Shear rate significantly alters the yielding transition in supercooled and glassy systems.
The transition from localization to flow becomes more abrupt at higher shear rates.
Suppressed Brownian motion at high shear rates leads to increased stress accumulation before yielding.