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research article

Dynamics and clogging of colloidal monolayers magnetically driven through a heterogeneous landscape

Leyva, Sergi Granados
•
Stoop, Ralph Lukas
•
Tierno, Pietro
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August 14, 2020
Soft Matter

We combine experiments and numerical simulations to investigate the emergence of clogging in a system of interacting paramagnetic colloidal particles driven against a disordered landscape of larger obstacles. We consider a single aperture in a landscape of immobile silica particles which are irreversibly attached to the substrate. We use an external rotating magnetic field to generate a traveling wave potential which drives the magnetic particles against these obstacles at a constant and frequency tunable speed. Experimentally we find that the particles display an intermittent dynamics with power law distributions at high frequencies. We reproduce these results by using numerical simulations and show that clogging in our system arises at large frequency, when the particles desynchronize with the moving landscape. Further, we use the model to explore the hidden role of flexibility in the obstacle displacements and the effect of hydrodynamic interactions between the particles. We also consider numerically the situation of a straight wall and investigate the range of parameters where clogging emerges in such case. Our work provides a soft matter test-bed system to investigate the effect of clogging in driven microscale matter.

  • Details
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Type
research article
DOI
10.1039/d0sm00904k
Web of Science ID

WOS:000555672700020

Author(s)
Leyva, Sergi Granados
Stoop, Ralph Lukas
Tierno, Pietro
Pagonabarraga, Ignacio  
Date Issued

2020-08-14

Publisher

ROYAL SOC CHEMISTRY

Published in
Soft Matter
Volume

16

Issue

30

Start page

6985

End page

6992

Subjects

Chemistry, Physical

•

Materials Science, Multidisciplinary

•

Physics, Multidisciplinary

•

Polymer Science

•

Chemistry

•

Materials Science

•

Physics

•

behavior

•

systems

•

future

•

flow

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
ISIC-GE  
Available on Infoscience
August 18, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/170902
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