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Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers
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Microscale Marangoni Surfers.

Kilian Dietrich1, Nick Jaensson2, Ivo Buttinoni3

  • 1Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zürich, 8093 Zürich, Switzerland.

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|September 11, 2020
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Summary
This summary is machine-generated.

Researchers created active Janus colloids that self-propel using laser-induced heating. These "Marangoni surfers" achieve high velocities by leveraging temperature and surfactant gradients for propulsion.

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Area of Science:

  • Soft Matter Physics
  • Colloid Science
  • Interfacial Phenomena

Background:

  • Janus colloids are particles with distinct properties on opposing faces.
  • Marangoni effect describes fluid flow driven by surface tension gradients.
  • Controlling microparticle motion is crucial for nanotechnology and materials science.

Purpose of the Study:

  • To investigate the self-propulsion of Janus colloids at water-oil interfaces.
  • To explore the role of laser-induced asymmetric heating in generating motion.
  • To characterize the propulsion mechanisms driven by thermal and solutal Marangoni stresses.

Main Methods:

  • Adsorbing Janus colloids at the water-oil interface.
  • Applying focused laser light to induce localized, asymmetric heating.
  • Utilizing video microscopy to track particle movement and measure velocities.
  • Employing finite element simulations to model the fluid dynamics and stress generation.

Main Results:

  • Demonstrated self-propulsion of Janus colloids, termed "Marangoni surfers."
  • Observed particle velocities spanning four orders of magnitude (microns/s to cm/s).
  • Correlated propulsion speed with laser power and surfactant concentration.
  • Identified distinct propulsion regimes based on thermal and solutal Marangoni stress contributions.

Conclusions:

  • Laser-induced asymmetric heating effectively drives Janus colloid self-propulsion via the Marangoni effect.
  • The study provides a tunable method for controlling microparticle motion at interfaces.
  • Finite element simulations successfully rationalize experimental observations and define propulsion regimes.