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Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature
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Fluidization Induced by Magnetic Interactions in Confined Active Matter.

Marco Musacchio1,2, Markus Felber3, Matteo Paoluzzi1

  • 1Sapienza Università di Roma, Dipartimento di Fisica, Piazzale A. Moro 2, I-00185, Rome, Italy.

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Magnetic active matter in confined spaces shows less clustering due to magnetic interactions. These interactions also lead to novel collective behaviors like train formations and rotating clusters.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Complex Systems

Background:

  • Active matter systems, like self-propelled particles, often exhibit boundary accumulation and clustering even at low densities.
  • Confined geometries can significantly alter the emergent behaviors of active matter.

Purpose of the Study:

  • To investigate the influence of magnetic interactions on active matter behavior in confined geometries.
  • To explore how magnetic forces affect particle clustering and collective motion.

Main Methods:

  • Experiments utilizing magnetic toy robots (Hexbugs).
  • Simulations of elongated magnetic active Brownian particles within circular domains.

Main Results:

  • Magnetic interactions induce a fluidization effect, delaying particle clustering to higher densities.
  • Observed collective behaviors include train-like formations, rotating pairs, and rotating clusters.
  • Standard active particles showed typical boundary accumulation and clustering.

Conclusions:

  • Magnetic interactions can suppress clustering in confined active matter systems.
  • Dipolar magnetic forces promote unique collective phenomena not seen in non-magnetic active matter.
  • Confined magnetic active matter offers a tunable platform for studying complex emergent behaviors.