6533b7defe1ef96bd1275c81
RESEARCH PRODUCT
Collective hydrodynamic transport of magnetic microrollers
Gaspard JunotAndrejs CebersPietro Tiernosubject
Field (physics)FOS: Physical sciences02 engineering and technologyCondensed Matter - Soft Condensed Matter01 natural sciences0103 physical sciencesPerpendicularCluster (physics)010306 general physicsAnisotropyParticle densityPhysicsRotating magnetic fieldMagnetismeCondensed matter physicsHidrodinàmicaMagnetismGeneral Chemistry021001 nanoscience & nanotechnologyCondensed Matter PhysicsDynamicsDipoleDinàmicaHydrodynamicsParticleSoft Condensed Matter (cond-mat.soft)0210 nano-technologydescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-01-01 |