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Asymmetrical Flow Field-Flow Fractionation for Sizing of Gold Nanoparticles in Suspension

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Underlying Asymmetry within Particle Size Segregation.

K van der Vaart¹, P Gajjar², G Epely-Chauvin¹

¹Environmental Hydraulics Laboratory, École Polytechnique Fédérale de Lausanne, Écublens, 1015 Lausanne, Switzerland.

Physical Review Letters

|July 22, 2015

Summary

This summary is machine-generated.

Particle segregation in mixtures shows an asymmetry dependent on local concentration. Small particles segregate faster with more large particles, revealing new physical insights into particle dynamics.

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Area of Science:

Physics
Materials Science
Chemical Engineering

Background:

Particle segregation is a complex phenomenon observed in various natural and industrial processes.
Understanding particle-scale dynamics is crucial for controlling segregation in granular mixtures.

Purpose of the Study:

To experimentally investigate particle-scale dynamics during the segregation of bidisperse mixtures under oscillatory shear.
To quantify the concentration-dependent asymmetry in segregation behavior.
To develop a theoretical framework capturing the observed segregation patterns.

Main Methods:

Experimental study of bidisperse particle mixtures subjected to oscillatory shear.
Particle-scale observation and analysis of segregation dynamics.
Theoretical modeling to explain the observed asymmetry.

Main Results:

An underlying asymmetry in segregation was observed, dependent on local particle concentration.
Small particles segregated faster in regions with high concentrations of large particles.
Large particles segregated slower in regions with high concentrations of small particles.

Conclusions:

The study provides new physical insights into particle segregation mechanisms.
A theoretical framework was developed to capture the observed segregation asymmetry.
The findings reveal similarities between oscillatory shear segregation and phenomena like sedimentation and traffic flow.