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Clustering induces switching between phoretic and osmotic propulsion in active colloidal rafts

Author

Listed:
  • Dolachai Boniface

    (Universitat de Barcelona)

  • Sergi G. Leyva

    (Universitat de Barcelona
    University of Barcelona Institute of Complex Systems (UBICS))

  • Ignacio Pagonabarraga

    (Universitat de Barcelona
    University of Barcelona Institute of Complex Systems (UBICS))

  • Pietro Tierno

    (Universitat de Barcelona
    University of Barcelona Institute of Complex Systems (UBICS))

Abstract

Active particles driven by chemical reactions are the subject of intense research to date due to their rich physics, being intrinsically far from equilibrium, and their multiple technological applications. Recent attention in this field is now shifting towards exploring the fascinating dynamics of active and passive mixtures. Here we realize active colloidal rafts, composed of a single catalytic particle encircled by several shells of passive microspheres, and assembled via light-activated chemophoresis. We show that the cluster propulsion mechanism transits from diffusiophoretic to diffusioosmotic as the number of colloidal shells increases. Using the Lorentz reciprocal theorem, we demonstrate that in large clusters self-propulsion emerges by considering the hydrodynamic flow via the diffusioosmotic response of the substrate. The dynamics in our active colloidal rafts are governed by the interplay between phoretic and osmotic effects. Thus, our work highlights their importance in understanding the rich physics of active catalytic systems.

Suggested Citation

  • Dolachai Boniface & Sergi G. Leyva & Ignacio Pagonabarraga & Pietro Tierno, 2024. "Clustering induces switching between phoretic and osmotic propulsion in active colloidal rafts," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-49977-5
    DOI: 10.1038/s41467-024-49977-5
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    References listed on IDEAS

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    1. Raphael Wittkowski & Adriano Tiribocchi & Joakim Stenhammar & Rosalind J. Allen & Davide Marenduzzo & Michael E. Cates, 2014. "Scalar φ4 field theory for active-particle phase separation," Nature Communications, Nature, vol. 5(1), pages 1-9, September.
    2. Martin K. Rasmussen & Jonas N. Pedersen & Rodolphe Marie, 2020. "Size and surface charge characterization of nanoparticles with a salt gradient," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    3. Juliane Simmchen & Jaideep Katuri & William E. Uspal & Mihail N. Popescu & Mykola Tasinkevych & Samuel Sánchez, 2016. "Topographical pathways guide chemical microswimmers," Nature Communications, Nature, vol. 7(1), pages 1-9, April.
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