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Driven Shear Flow in Biological Magnetoactive Fluids.

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Researchers harnessed magnetotactic bacteria

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Area of Science:

  • Physics and Biology
  • Active Matter Physics
  • Biophysics

Background:

  • Active fluids exhibit spontaneous patterns and flows.
  • Controlling active fluid behavior with external cues is crucial for applications.

Purpose of the Study:

  • To investigate the control of macroscopic shear flows using magnetotactic bacteria.
  • To understand how external fields influence the collective behavior of active swimmers.

Main Methods:

  • Utilizing magnetotactic bacteria responsive to magnetic and chemical signals.
  • Applying external fields to shape swimmer order and generate active stress.
  • Developing a magnetoactive model to capture observed flows.

Main Results:

  • External fields successfully controlled the onset of global scale shear flows.
  • The collective force dipoles of swimmers formed a finite active stress.
  • The model quantitatively predicted steady-state flows.
  • Time-dependent responses to rotating fields revealed complex dynamics.

Conclusions:

  • Magnetotactic bacteria can be effectively controlled to generate macroscopic flows.
  • Active stress generated by ordered swimmers is a key factor in flow generation.
  • The developed model provides a quantitative framework for understanding active fluid dynamics.