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Title: Programmable chiral states in flocks of active magnetic rollers

Abstract

Inspired by nature, active matter exemplified by self-organization of motile units into macroscopic structures holds great promise for advanced tunable materials capable of flocking, shape-shifting, and self-healing. Active particles driven by external fields have repeatedly demonstrated potential for complex self-organization and collective behavior, yet how to guide the direction of their collective motion largely remains unexplored. Here, we report a system of microscopic ferromagnetic rollers driven by an alternating magnetic field that demonstrates programmable control of the direction of a self-organized coherent vortical motion (i.e., chirality). Facilitated by a droplet confinement, the rollers get synchronized and display either right- or left-handed spontaneous vortical motion, such that their moving direction determines the vortex chirality. Here, we reveal that one can remotely command a flock of magnetic rollers to switch or maintain its chiral state by modulating a phase shift of the sinusoidal magnetic field powering the active rollers. Building on our findings, we realize a self-assembled remotely controlled micro-pump architecture capable of switching the fluid transport direction on demand. Our studies may stimulate new design strategies for directed transport and flocking robotics at the microscale based on active colloids.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
OSTI Identifier:
1756287
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Lab on a Chip
Additional Journal Information:
Journal Volume: 21; Journal Issue: 1; Journal ID: ISSN 1473-0197
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Han, Koohee, and Snezhko, Alexey. Programmable chiral states in flocks of active magnetic rollers. United States: N. p., 2020. Web. https://doi.org/10.1039/d0lc00892c.
Han, Koohee, & Snezhko, Alexey. Programmable chiral states in flocks of active magnetic rollers. United States. https://doi.org/10.1039/d0lc00892c
Han, Koohee, and Snezhko, Alexey. Thu . "Programmable chiral states in flocks of active magnetic rollers". United States. https://doi.org/10.1039/d0lc00892c. https://www.osti.gov/servlets/purl/1756287.
@article{osti_1756287,
title = {Programmable chiral states in flocks of active magnetic rollers},
author = {Han, Koohee and Snezhko, Alexey},
abstractNote = {Inspired by nature, active matter exemplified by self-organization of motile units into macroscopic structures holds great promise for advanced tunable materials capable of flocking, shape-shifting, and self-healing. Active particles driven by external fields have repeatedly demonstrated potential for complex self-organization and collective behavior, yet how to guide the direction of their collective motion largely remains unexplored. Here, we report a system of microscopic ferromagnetic rollers driven by an alternating magnetic field that demonstrates programmable control of the direction of a self-organized coherent vortical motion (i.e., chirality). Facilitated by a droplet confinement, the rollers get synchronized and display either right- or left-handed spontaneous vortical motion, such that their moving direction determines the vortex chirality. Here, we reveal that one can remotely command a flock of magnetic rollers to switch or maintain its chiral state by modulating a phase shift of the sinusoidal magnetic field powering the active rollers. Building on our findings, we realize a self-assembled remotely controlled micro-pump architecture capable of switching the fluid transport direction on demand. Our studies may stimulate new design strategies for directed transport and flocking robotics at the microscale based on active colloids.},
doi = {10.1039/d0lc00892c},
journal = {Lab on a Chip},
number = 1,
volume = 21,
place = {United States},
year = {2020},
month = {11}
}

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