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Updated: Apr 6, 2026

Asymmetrical Flow Field-Flow Fractionation for Sizing of Gold Nanoparticles in Suspension
Published on: September 11, 2020
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.
Abstract:
We experimentally study particle scale dynamics during segregation of a bidisperse mixture under oscillatory shear. Large and small particles show an underlying asymmetry that is dependent on the local particle concentration, with small particles segregating faster in regions of many large particles and large particles segregating slower in regions of many small particles. We quantify the asymmetry on bulk and particle scales, and capture it theoretically. This gives new physical insight into segregation and reveals a similarity with sedimentation, traffic flow, and particle diffusion.
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