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Manipulation of emergent vortices in swarms of magnetic rollers

Journal Article · · Nature Communications

Here, active colloids are an emergent class of out-of-equilibrium materials demonstrating complex collective phases and tunable functionalities. Microscopic particles energized by external fields exhibit a plethora of fascinating collective phenomena, yet mechanisms of control and manipulation of active phases often re-mains lacking. Here we report the emergence of unconfined macroscopic vortices in a system of ferromagnetic rollers energized by a vertical alternating magnetic field and elucidate the complex nature of a magnetic roller-vortex interactions with inert scatterers. We demonstrate that active self-organized vortices have an ability to spontaneously switch the direction of rotation and move across the surface. We reveal the capability of certain non-active particles to pin the vortex and manipulate its dynamics. Building on our findings, we demonstrate the potential of magnetic roller vortices to effectively capture and transport inert particles at the microscale.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1460740
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Engineering bacterial vortex lattice via direct laser lithography journal October 2018
Quorum-sensing active particles with discontinuous motility journal January 2020
Reconfigurable structure and tunable transport in synchronized active spinner materials journal March 2020
Oscillatory chiral flows in confined active fluids with obstacles text January 2020
Collective oscillation in dense suspension of self-propelled chiral rods journal January 2019
Diffusive ferromagnetic roller gas journal January 2019
Enhanced diffusion and magnetophoresis of paramagnetic colloidal particles in rotating magnetic fields journal January 2019
Reconfigurable magnetic microrobot swarm: Multimode transformation, locomotion, and manipulation journal March 2019
Microwheels on microroads: Enhanced translation on topographic surfaces journal July 2019

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