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    Directed Flow of Micromotors through Alignment Interactions with Micropatterned Ratchets
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    • Jaideep Katuri
      Jaideep Katuri
      Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain
      Max-Planck Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany
      More by Jaideep Katuri
    • David Caballero
      David Caballero
      Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain
      Department of Electronics and Biomedical Engineering, University of Barcelona (UB), 08028 Barcelona, Spain
      Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Av. Monforte de Lemos, 3-5, 28029 Madrid, Spain
      More by David Caballero
      Orcidhttp://orcid.org/0000-0001-7930-2535
    • Raphael Voituriez
      Raphael Voituriez
      Laboratoire de Physique Théorique de la Matière Condensée, UMR 7600 CNRS/UPMC, 4 Place Jussieu, 75255 Cedex Paris, France
      Laboratoire Jean Perrin, UMR 8237 CNRS/UPMC, 4 Place Jussieu, 75255 Cedex Paris, France
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    • Josep Samitier
      Josep Samitier
      Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain
      Department of Electronics and Biomedical Engineering, University of Barcelona (UB), 08028 Barcelona, Spain
      Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Av. Monforte de Lemos, 3-5, 28029 Madrid, Spain
      More by Josep Samitier
    • Samuel Sanchez*
      Samuel Sanchez
      Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), 08028 Barcelona, Spain
      Max-Planck Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany
      Institució Catalana de Recerca i Estudis Avancats (ICREA), Pg. Lluís Companys 23, 08010 Barcelona, Spain
      *E-mail: [email protected]
      More by Samuel Sanchez
      Orcidhttp://orcid.org/0000-0002-5845-8941
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    ACS Nano

    Cite this: ACS Nano 2018, 12, 7, 7282–7291
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    https://doi.org/10.1021/acsnano.8b03494
    Published June 27, 2018
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    Abstract

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    To achieve control over naturally diffusive, out-of-equilibrium systems composed of self-propelled particles, such as cells or self-phoretic colloids, is a long-standing challenge in active matter physics. The inherently random motion of these active particles can be rectified in the presence of local and periodic asymmetric cues given that a nontrivial interaction exists between the self-propelled particle and the cues. Here, we exploit the phoretic and hydrodynamic interactions of synthetic micromotors with local topographical features to break the time-reversal symmetry of particle trajectories and to direct a macroscopic flow of micromotors. We show that the orientational alignment induced on the micromotors by the topographical features, together with their geometrical asymmetry, is crucial in generating directional particle flow. We also show that our system can be used to concentrate micromotors in confined spaces and identify the interactions leading to this effect. Finally, we develop a minimal model, which identifies the key parameters of the system responsible for the observed rectification. Overall, our system allows for robust control over both temporal and spatial distribution of synthetic micromotors.

    Copyright © 2018 American Chemical Society

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    ACS Nano

    Cite this: ACS Nano 2018, 12, 7, 7282–7291
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsnano.8b03494
    Published June 27, 2018
    Copyright © 2018 American Chemical Society
    Request reuse permissions

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