Collective hydrodynamic transport of magnetic microrollers

We investigate the collective transport properties of microscopic magnetic rollers that propel close to a surface due to a circularly polarized, rotating magnetic field. The applied field exerts a torque to the particles, which induces a net rolling motion close to a surface. The collective dynamics...

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Bibliographic Details
Published in:Soft matter 2021-10, Vol.17 (38), p.865-8611
Main Authors: Junot, Gaspard, Cebers, Andrejs, Tierno, Pietro
Format: Article
Language:English
Subjects:
Circular polarization
Clustering
Hydrodynamics
Magnetic fields
Magnetic properties
Particle density (concentration)
Rolling motion
Transport properties
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Summary:We investigate the collective transport properties of microscopic magnetic rollers that propel close to a surface due to a circularly polarized, rotating magnetic field. The applied field exerts a torque to the particles, which induces a net rolling motion close to a surface. The collective dynamics of the particles result from the balance between magnetic dipolar interactions and hydrodynamic ones. We show that, when hydrodynamics dominate, i.e. for high particle spinning, the collective mean velocity linearly increases with the particle density. In this regime we analyse the clustering kinetics, and find that hydrodynamic interactions between the anisotropic, elongated particles, induce preferential cluster growth along a direction perpendicular to the driving one, leading to dynamic clusters that easily break and reform during propulsion. We investigate the collective dynamics of magnetically driven microrollers that propel and assemble under the combined action of magnetism and hydrodynamics. We describe the collective mean velocity and the dynamic clustering.
ISSN:1744-683X
1744-6848
DOI:10.1039/d1sm00653c