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Pathway selection by an active droplet.

Shiva Dixit1, Aarsh Chotalia1, Shantanu Shukla2

  • 1Department of Physics, Indian Institute of Technology Bombay, Mumbai, Maharashtra 400 076, India. drs2015@iitb.ac.in.

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Summary
This summary is machine-generated.

Active 1-pentanol drops navigate Y-shaped channels, demonstrating remarkable directional control. This study reveals artificial negative chemotaxis in asymmetric environments, showcasing precise navigation capabilities.

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Area of Science:

  • Soft Matter Physics
  • Microfluidics
  • Chemical Engineering

Background:

  • Understanding the directed movement of active droplets is crucial for micro-scale transport and self-assembly.
  • Investigating droplet navigation in confined geometries with external stimuli is key to developing artificial motility systems.

Purpose of the Study:

  • To investigate the navigation behavior of an active 1-pentanol drop in a Y-shaped channel.
  • To analyze the influence of geometrical and chemical asymmetry on droplet pathway selection.
  • To model and validate the observed navigation phenomena using numerical simulations.

Main Methods:

  • Experimental setup using a closed Y-shaped channel with a 120° arm angle.
  • Observation of 1-pentanol drop movement under geometric and chemical asymmetry.
  • Development of a numerical model incorporating repulsive forces, self-propulsion, drag, and stochastic forces.

Main Results:

  • Active drops exhibited accurate navigation, selecting specific pathways away from the decision region.
  • High accuracy rates of 80% for geometric asymmetry and 100% for chemical asymmetry were recorded.
  • Artificial negative chemotaxis was demonstrated, with confined drops acting as chemo-repellents.

Conclusions:

  • Active droplets possess inherent navigation capabilities in asymmetric environments.
  • The numerical model accurately replicates experimental findings, validating the force interactions.
  • This work provides insights into directed droplet movement, relevant for microfluidic applications and artificial chemotaxis.