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Title: Flocking ferromagnetic colloids

Journal Article · · Science Advances
 [1];  [1];  [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)

Assemblages of microscopic colloidal particles exhibit fascinating collective motion when energized by electric or magnetic fields. The behaviors range from coherent vortical motion to phase separation and dynamic self-assembly. While colloidal systems are relatively simple, understanding their collective response, especially in out of equilibrium conditions, remains elusive. Here, we report on the emergence of flocking and global rotation in the system of rolling ferromagnetic microparticles energized by a vertical alternating magnetic field. By combing experiments and discrete particle simulations, we have identified primary physical mechanisms leading to the emergence of largescale collective motion: spontaneous symmetry breaking of the clock / counterclockwise particle rotation, collisional alignment of particle velocities, and random particle re-orientations due to shape imperfections. We have also shown that hydrodynamic interactions between the particles do not have a qualitative effect on the collective dynamics. Lastly, our findings shed light on the onset of spatial and temporal coherence in a large class of active systems, both synthetic (colloids, swarms of robots, biopolymers) and living (suspensions of bacteria, cell colonies, bird flocks).

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Materials Sciences and Engineering Division; German Research Foundation (DFG)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1353032
Journal Information:
Science Advances, Vol. 3, Issue 2; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 130 works
Citation information provided by
Web of Science

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Cited By (29)

Magnetically tunable bidirectional locomotion of a self-assembled nanorod-sphere propeller journal April 2018
Enhanced diffusion and magnetophoresis of paramagnetic colloidal particles in rotating magnetic fields journal January 2019
Hydrodynamic assembly of active colloids: chiral spinners and dynamic crystals text January 2018
Manipulation of emergent vortices in swarms of magnetic rollers journal June 2018
Ultra-extensible ribbon-like magnetic microswarm journal August 2018
On-demand orbital maneuver of multiple soft robots via hierarchical magnetomotility journal October 2019
Reaction processes among self-propelled particles journal January 2019
Microwheels on microroads: Enhanced translation on topographic surfaces journal July 2019
Assembly and transport of nematic colloidal swarms above photo-patterned defects and surfaces journal July 2018
Self-assembled nematic colloidal motors powered by light text January 2020
Hydrodynamic self-assembly of active colloids: chiral spinners and dynamic crystals journal January 2019
Modeling chemo-hydrodynamic interactions of phoretic particles: A unified framework journal December 2019
Engineering bacterial vortex lattice via direct laser lithography journal October 2018
Shape-programmed 3D printed swimming microtori for the transport of passive and active agents text January 2019
Active turbulence in a gas of self-assembled spinners journal November 2017
Reconfigurable magnetic microrobot swarm: Multimode transformation, locomotion, and manipulation journal March 2019
Active Particles Powered by Quincke Rotation in a Bulk Fluid. text January 2019
Colloidal Brazil nut effect in microswimmer mixtures induced by motility contrast journal March 2019
Self-assembled nematic colloidal motors powered by light journal November 2018
Propagating density spikes in light-powered motility-ratchets journal January 2019
Tuning the self-organization of confined active particles by the steepness of the trap journal January 2019
Shape-programmed 3D printed swimming microtori for the transport of passive and active agents journal October 2019
Actuation of magnetoelastic membranes in precessing magnetic fields journal January 2019
Active Particles Powered by Quincke Rotation in a Bulk Fluid journal May 2019
Sequence-encoded colloidal origami and microbot assemblies from patchy magnetic cubes journal August 2017
A finite volume method for continuum limit equations of nonlocally interacting active chiral particles journal September 2021
Dynamic self-assembly and self-organized transport of magnetic micro-swimmers journal November 2017
Reconfigurable structure and tunable transport in synchronized active spinner materials journal March 2020
3-D Printed Swimming Microtori for Cargo Transport and Flow Manipulation text January 2020

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