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Manipulation of self-organized multi-vortical states in active magnetic roller suspensions

Journal Article · · Journal of Magnetism and Magnetic Materials
 [1];  [2];  [3];  [2]
  1. Argonne National Laboratory (ANL), Argonne, IL (United States); Kyungpook National Univ., Daegu (Korea, Republic of)
  2. Argonne National Laboratory (ANL), Argonne, IL (United States)
  3. Argonne National Laboratory (ANL), Argonne, IL (United States); Northern Illinois Univ., DeKalb, IL (United States)

Ensembles of active magnetic colloids demonstrate complex collective behavior and self-organization when driven out of equilibrium by external magnetic fields. The interplay between magnetic and hydrodynamic interactions often result in spontaneous self-assembly and the emergence of localized vortices in ensembles of ferromagnetic rollers. We report experimental and computational study of the self-organized multi-vortical state in ensembles of magnetic rollers under the imposed external confining potential realized by patterned substrates. We explore the behavior of the system on a substrate patterned with shallow wells ordered in a lattice with square symmetry and lattice spacing smaller than the wells’ diameter. Here we demonstrate, that ensembles of active magnetic rollers evolve in response to changes in the geometry of the confining lattice from a globally correlated state characterized by anti-ferromagnetic vortex ordering to a state with rapidly changing particle flows and self-organized vortical states with a lattice constant larger than one of the confining pattern. Our experimental observations are accompanied by numerical simulations based on phenomenological coarse grained particle dynamics coupled to Navier–Stokes hydrodynamics in shallow water approximation. The reported results provide insights into the collective behavior of active magnetic rollers under confinement and suggest strategies for the manipulation of collective dynamic states in active magnetic liquids.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Foundation of Korea (NRF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2478071
Alternate ID(s):
OSTI ID: 2229835
Journal Information:
Journal of Magnetism and Magnetic Materials, Journal Name: Journal of Magnetism and Magnetic Materials Vol. 589; ISSN 0304-8853
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (42)

Transport and Assembly of Magnetic Surface Rotors** journal May 2021
Wave breaking for nonlinear nonlocal shallow water equations journal January 1998
Flexible magnetic filaments journal October 2005
Complex collective dynamics of active torque-driven colloids at interfaces journal February 2016
Collective motion journal August 2012
Dynamic Assembly of Magnetic Colloidal Vortices journal May 2016
Guided Self-Assembly and Control of Vortices in Ensembles of Active Magnetic Rollers journal November 2019
Spontaneous motion in hierarchically assembled active matter journal November 2012
Emergence of macroscopic directed motion in populations of motile colloids journal November 2013
Emergent vortices in populations of colloidal rollers journal June 2015
Magnetic manipulation of self-assembled colloidal asters journal August 2011
Ferromagnetic and antiferromagnetic order in bacterial vortex lattices journal January 2016
Distortion and destruction of colloidal flocks in disordered environments journal October 2016
Unstable fronts and motile structures formed by microrollers journal December 2016
Manipulation of emergent vortices in swarms of magnetic rollers journal June 2018
The odd free surface flows of a colloidal chiral fluid journal September 2019
Polar state reversal in active fluids journal December 2021
Dynamic self-assembly and self-organized transport of magnetic micro-swimmers journal November 2017
Emergence of reconfigurable wires and spinners via dynamic self-assembly journal March 2015
Fully alternating, triaxial electric or magnetic fields offer new routes to fluid vorticity journal January 2015
Geometry-driven collective ordering of bacterial vortices journal January 2017
Diffusive ferromagnetic roller gas journal January 2019
Collective hydrodynamic transport of magnetic microrollers journal January 2021
Emergence and dynamics of unconfined self-organised vortices in active magnetic roller liquids journal January 2021
Magnetic fluids journal February 1974
Active turbulence in a gas of self-assembled spinners journal November 2017
Emergence of self-organized multivortex states in flocks of active rollers journal April 2020
Driving self-assembly and emergent dynamics in colloidal suspensions by time-dependent magnetic fields journal November 2013
Model for dynamic self-assembled magnetic surface structures journal July 2010
Pace and patterns of magnetic swimmers in a billiard pool journal July 2017
Quantifying hydrodynamic collective states of magnetic colloidal spinners and rollers journal January 2019
Field-Induced Self-Assembly of Suspended Colloidal Membranes journal November 2009
Viscosity Control of the Dynamic Self-Assembly in Ferromagnetic Suspensions journal May 2013
Concentration Dependence of the Collective Dynamics of Swimming Bacteria journal April 2007
Self-Motile Colloidal Particles: From Directed Propulsion to Random Walk journal July 2007
Oscillatory chiral flows in confined active fluids with obstacles journal November 2020
Globally correlated states and control of vortex lattices in active roller fluids journal April 2023
Hydrodynamics of soft active matter journal July 2013
Flocking ferromagnetic colloids journal February 2017
Sequence-encoded colloidal origami and microbot assemblies from patchy magnetic cubes journal August 2017
Reconfigurable structure and tunable transport in synchronized active spinner materials journal March 2020
Arrested-motility states in populations of shape-anisotropic active Janus particles journal July 2022

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