Guided Self-Assembly and Control of Vortices in Ensembles of Active Magnetic Rollers

Kokot, Gašper; Sokolov, Andrey; Snezhko, Alexey

doi:10.1021/acs.langmuir.9b03023

Title: Guided Self-Assembly and Control of Vortices in Ensembles of Active Magnetic Rollers

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Abstract

Active magnetic colloids are capable of rich collective behavior and complex self-organization. The interplay between short- and long-range interactions taking place away from equilibrium often results in a spontaneous formation of localized dynamic microstructures. Here we report a method for guided self-assembly and control of self-organized colloidal vortices emerging in a ferromagnetic particle ensemble energized by a uniaxial alternating (ac) magnetic field. The structure of a vortex composed of rolling magnetic particles can be stabilized and manipulated by means of an additional strongly localized alternating magnetic field provided by a minicoil. By tuning the parameters of the localized field, we effectively control the dimensions and particle number density in the vortex. We find that the roller vortex self-organization is assisted by field-induced magnetic "steering" rather than magnetic field gradients and is only possible while the system is in the active (magnetic rollers) state. In this work, we demonstrate that parameters of the emergent vortex are efficiently tuned by a phase shift between alternating magnetic fields. Overall, the method for assisted self-organization of rolling magnetic colloids into a vortex with on-demand characteristics suggests a new tool for active matter control and manipulation that may lead to a development of new approachesmore »« less

Authors:

Kokot, Gašper ^[1]; Sokolov, Andrey ^[2];

^[2]

Northwestern Univ., Evanston, IL (United States) Northwestern Argonne Institute of Science and Engineering (NAISE); Argonne National Lab. (ANL), Lemont, IL (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)

Publication Date:: Fri Nov 22 00:00:00 EST 2019

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:: 1641747

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Langmuir

Additional Journal Information:: Journal Volume: 36; Journal Issue: 25; Journal ID: ISSN 0743-7463

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Chemical structure; magnetic properties; self organization; phase transitions; colloidal particles

Citation Formats


                    Kokot, Gašper, Sokolov, Andrey, and Snezhko, Alexey. Guided Self-Assembly and Control of Vortices in Ensembles of Active Magnetic Rollers.  United States: N. p., 2019. 
Web.  doi:10.1021/acs.langmuir.9b03023.

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                    Kokot, Gašper, Sokolov, Andrey, & Snezhko, Alexey. Guided Self-Assembly and Control of Vortices in Ensembles of Active Magnetic Rollers.  United States.  https://doi.org/10.1021/acs.langmuir.9b03023

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                    Kokot, Gašper, Sokolov, Andrey, and Snezhko, Alexey. Fri .  
"Guided Self-Assembly and Control of Vortices in Ensembles of Active Magnetic Rollers".  United States.  https://doi.org/10.1021/acs.langmuir.9b03023.  https://www.osti.gov/servlets/purl/1641747.

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@article{osti_1641747,

  title        = {Guided Self-Assembly and Control of Vortices in Ensembles of Active Magnetic Rollers},

  author       = {Kokot, Gašper and Sokolov, Andrey and Snezhko, Alexey},

  abstractNote = {Active magnetic colloids are capable of rich collective behavior and complex self-organization. The interplay between short- and long-range interactions taking place away from equilibrium often results in a spontaneous formation of localized dynamic microstructures. Here we report a method for guided self-assembly and control of self-organized colloidal vortices emerging in a ferromagnetic particle ensemble energized by a uniaxial alternating (ac) magnetic field. The structure of a vortex composed of rolling magnetic particles can be stabilized and manipulated by means of an additional strongly localized alternating magnetic field provided by a minicoil. By tuning the parameters of the localized field, we effectively control the dimensions and particle number density in the vortex. We find that the roller vortex self-organization is assisted by field-induced magnetic "steering" rather than magnetic field gradients and is only possible while the system is in the active (magnetic rollers) state. In this work, we demonstrate that parameters of the emergent vortex are efficiently tuned by a phase shift between alternating magnetic fields. Overall, the method for assisted self-organization of rolling magnetic colloids into a vortex with on-demand characteristics suggests a new tool for active matter control and manipulation that may lead to a development of new approaches toward the guided microscopic transport in active particle systems.},

  doi          = {10.1021/acs.langmuir.9b03023},

  journal      = {Langmuir},

  number       = 25,

  volume       = 36,

  place        = {United States},

  year         = {Fri Nov 22 00:00:00 EST 2019},

  month        = {Fri Nov 22 00:00:00 EST 2019}

}

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