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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: Nov 12, 2025

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Particle sizing for flowing colloidal suspensions using flow-differential dynamic microscopy.

James A Richards¹, Vincent A Martinez, Jochen Arlt

¹SUPA and School of Physics and Astronomy, University of Edinburgh, King's Buildings, Edinburgh EH9 3FD, UK. james.a.richards@ed.ac.uk vincent.martinez@ed.ac.uk j.arlt@ed.ac.uk.

|March 16, 2021

Summary

This summary is machine-generated.

Flow-DDM enables accurate particle size measurement in flowing, turbid samples. This novel technique overcomes limitations of traditional methods, allowing for in-line manufacturing and development testing.

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Last Updated: Nov 12, 2025

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Published on: May 20, 2014

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Published on: January 9, 2017

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Area of Science:

Materials Science
Physical Chemistry
Optical Physics

Background:

Particle size is critical for understanding particulate product behavior.
Current methods often require static samples, limiting real-time manufacturing and development applications.
Turbid samples with multiply scattering light pose challenges for conventional sizing techniques.

Purpose of the Study:

To develop a method for measuring particle size in flowing, turbid samples.
To overcome the limitations of Differential Dynamic Microscopy (DDM) in dynamic flow conditions.
To enable in-line and high-throughput particle size analysis.

Main Methods:

Development of "flow-DDM", a novel analysis scheme.
Optimized imaging conditions and drift-velocity correction.
Modeling the impact of fluid flow on diffusive dynamics.

Main Results:

Flow-DDM successfully decouples flow effects from diffusive motion.
Particle size measurements are achieved at flow speeds an order of magnitude higher than standard DDM.
The technique demonstrated generality across different microscopy methods and flow geometries.

Conclusions:

Flow-DDM significantly advances particle sizing capabilities for dynamic and challenging sample conditions.
This method opens new avenues for real-time process monitoring and material development.
The approach is robust and applicable to various experimental setups.