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Alignment and scattering of colliding active droplets.

Kevin Lippera1, Michael Benzaquen1, Sébastien Michelin1

  • 1LadHyX - Département de Mécanique, CNRS - Ecole Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau, France. sebastien.michelin@ladhyx.polytechnique.fr.

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Active droplets propel themselves using chemical solute and Marangoni flows. Oblique collisions cause trajectory alignment in symmetric cases and scattering in generic ones, impacting collective behavior.

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Area of Science:

  • Chemical physics
  • Fluid dynamics
  • Soft matter physics

Background:

  • Active droplets self-propel by emitting solute, altering interfacial tension and generating Marangoni flows.
  • These droplets exhibit anti-chemotactic behavior, repelling their chemical wake and neighbors.
  • Previous studies detailed head-on collision dynamics using a bispherical approach.

Purpose of the Study:

  • To extend the analysis of droplet interactions to oblique collisions.
  • To develop a reduced model for characterizing generic droplet collision dynamics.
  • To investigate the impact of collision geometry on collective droplet behavior.

Main Methods:

  • Development of a reduced model for generic droplet collisions.
  • Analysis of droplet trajectory alignment and scattering properties.
  • Investigation of pairwise droplet interactions in oblique scenarios.

Main Results:

  • Observed systematic alignment of droplet trajectories during symmetric oblique collisions.
  • Attributed alignment to the rearrangement of the chemical wake during interaction.
  • Identified complex and diverse dynamical regimes in generic oblique collisions, leading to significant scattering.

Conclusions:

  • Oblique collisions introduce complex dynamics, including trajectory alignment and scattering.
  • The findings provide insights into the collective behavior of active droplets.
  • The reduced model offers a framework for understanding droplet-droplet interactions in various collision geometries.