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Density Modulations in Active Colloidal Systems through Orthogonal Propulsion Control and Sensory Delays.

Ueli Töpfer1, Maximilian R Bailey1, Sanjay Schreiber1

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Summary
This summary is machine-generated.

Researchers developed adaptive Janus microswimmers that autonomously adjust their speed in response to light and chemicals. This sensory delay enhances microswimmer localization, mimicking biological systems for advanced active matter applications.

Keywords:
active matterdensity modulationsinduced-charge electrophoresisorthogonal controlphotoconductivitysensory delay

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Area of Science:

  • Colloidal science
  • Active matter physics
  • Microfluidics

Background:

  • Active colloidal systems and synthetic microswimmers are inspired by biological counterparts.
  • Current systems often require external control for adaptive motility.
  • Autonomous self-regulation in response to environmental stimuli is a key challenge.

Purpose of the Study:

  • To develop Janus microswimmers with autonomous adaptive propulsion.
  • To investigate the response of these microswimmers to varying illumination and chemical agents.
  • To explore the role of sensory delay in microswimmer behavior and localization.

Main Methods:

  • Fabrication of Janus microparticles (silica/titania).
  • Utilizing electrohydrodynamic flows and induced-charge electrophoresis for propulsion.
  • Applying uniform AC electric fields and UV illumination.
  • Introducing chemical agents (methanol) to alter particle dynamics.

Main Results:

  • Janus microswimmers demonstrated light-dependent propulsion velocity regulation.
  • Photoconductivity of titania enabled autonomous speed adjustment under UV light.
  • A finite sensory delay in velocity adaptation was observed.
  • Particles showed concentration-dependent response time adaptation to methanol.
  • Enhanced microswimmer localization was achieved due to sensory delay.

Conclusions:

  • Developed microswimmers exhibit autonomous adaptation to environmental stimuli (light, chemicals).
  • Sensory delay enhances localization, mimicking biological microswimmer strategies.
  • Potential for novel adaptive active matter systems and microdevices.