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Interfacial aggregation of self-propelled Janus colloids in sessile droplets

Maziyar Jalaal1, Borge ten Hagen2, Hai le The3, Christian Diddens2,4, Detlef Lohse2,5, and Alvaro Marin2,*

  • 1Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
  • 2Physics of Fluids, University of Twente, 7522 NB Enschede, The Netherlands
  • 3Physics of Fluids and BIOS Lab on a Chip, University of Twente, 7522 NB Enschede, The Netherlands
  • 4Department of Physics, Eindhoven Technical University, 5612 AZ Eindhoven, The Netherlands
  • 5Max Planck Center Twente for Complex Fluid Dynamics and J.M. Burgers Centre for Fluid Mechanics, University of Twente

  • *a.marin@utwente.nl
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Phys. Rev. Fluids 7, 110514 – Published 17 November, 2022

DOI: https://doi.org/10.1103/PhysRevFluids.7.110514

Abstract

Living microorg anisms in confined systems typically experience an affinity to populate boundaries. The reason for such affinity to interfaces can be a combination of their directed motion and hydrodynamic interactions at distances larger than their own size. Here we will show that self-propelled Janus particles (polystyrene particles partially coated with platinum) immersed in droplets of water and hydrogen peroxide tend to accumulate in the vicinity of the liquid/gas interface. Interestingly, the interfacial accumulation occurs despite the presence of an evaporation-driven flow caused by a solutal Marangoni flow, which typically tends to redistribute the particles within the droplet's bulk. By performing additional experiments with passive colloids (flow tracers) and comparing with numerical simulations for both particle active motion and the fluid flow, we disentangle the dominating mechanisms behind the observed interfacial particle accumulation. These results allow us to make an analogy between active Janus particles and some biological microswimmers concerning how they interact with their environment.

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Phys. Rev. Fluids 7, 110514– Published 17 November, 2022
  • Received 12 June 2022
  • Accepted 20 September 2022
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