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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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Colloids and Suspensions

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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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Related Experiment Video

Updated: Jan 28, 2026

Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures

Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures

Published on: August 10, 2017

Binary colloidal glasses: linear viscoelasticity and its link to the microscopic structure and dynamics.

Tatjana Sentjabrskaja¹, Alan R Jacob, Stefan U Egelhaaf

¹Condensed Matter Physics Laboratory, Heinrich Heine University, Düsseldorf, Germany.

|February 23, 2019

Summary

This study links microscopic particle behavior to macroscopic flow properties in colloidal suspensions. We found that particle dynamics and structure directly influence the material

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Last Updated: Jan 28, 2026

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Correlative Microscopy for 3D Structural Analysis of Dynamic Interactions

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Published on: June 24, 2013

Area of Science:

Colloidal science
Soft matter physics
Rheology

Background:

Understanding the relationship between microscopic structure/dynamics and macroscopic rheology is crucial for glass-forming materials.
Colloidal hard-sphere mixtures with significant size asymmetry present complex rheological behaviors near the glass transition.

Purpose of the Study:

To investigate the correlation between microscopic properties and macroscopic rheological response in binary colloidal hard-sphere mixtures.
To explore how varying mixture compositions affect particle dynamics, structure, and mechanical moduli.

Main Methods:

Oscillatory rheology to measure dynamical shear moduli.
Confocal microscopy for single-particle level structure and dynamics analysis.
Brownian Dynamics simulations and mode-coupling theory for comparison.

Main Results:

Observed a non-monotonic dependence of intermediate-frequency mechanical moduli and particle dynamics on mixture composition.
Found that particle localization decreases monotonically with increasing small particle fraction.
Validated the Generalized-Stokes Einstein relation for estimating shear moduli from particle dynamics.

Conclusions:

The rheological response of these colloidal suspensions is directly linked to particle dynamics.
Microscopic structure and dynamics, as captured by mean squared displacements, effectively predict macroscopic properties.
This work provides a bridge between microscopic behavior and macroscopic flow in complex fluids.