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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 visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...

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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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Challenges in Rheological Characterization of Highly Concentrated Suspensions — A Case Study for Screen-printing Silver Pastes

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Dynamic jamming point for shear thickening suspensions.

Eric Brown¹, Heinrich M Jaeger

¹The James Franck Institute, University of Chicago, Chicago, Illinois 60637, USA.

Physical Review Letters

|October 2, 2009

Summary

This summary is machine-generated.

This study reveals that shear thickening suspensions exhibit critical behavior, with viscosity and yield stress diverging at a critical packing fraction. This leads to a dynamic jamming phase diagram for suspensions.

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Area of Science:

Rheology and soft matter physics
Material science of suspensions

Background:

Shear thickening suspensions, like cornstarch in water, exhibit complex flow behaviors.
Understanding critical phenomena in these materials is crucial for predicting their performance.

Purpose of the Study:

To characterize the critical behavior of shear thickening suspensions using rheometry.
To investigate the relationship between packing fraction, viscosity, and yield stress.

Main Methods:

Rheometry measurements were performed on model suspensions (cornstarch in water, glass spheres in oil).
Viscosity curves were analyzed to determine critical exponents and scaling laws.

Main Results:

The slope of shear thickening increases with packing fraction, diverging at a critical packing fraction (phi_c).
Viscosity and yield stress also diverge at phi_c, following specific scaling laws.
A transition from shear thickening to shear thinning was observed above a critical yield stress.

Conclusions:

A dynamic jamming phase diagram for suspensions was developed based on the experimental data.
Shear thickening in these model systems can represent a jammed state under specific conditions.