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Active boundary layers in confined active nematics

Author

Listed:
  • Jerôme Hardoüin

    (Universitat de Barcelona
    Universitat de Barcelona)

  • Claire Doré

    (Laboratoire Gulliver, UMR CNRS 7636, ESPCI Paris, PSL Research University)

  • Justine Laurent

    (Laboratoire Gulliver, UMR CNRS 7636, ESPCI Paris, PSL Research University)

  • Teresa Lopez-Leon

    (Laboratoire Gulliver, UMR CNRS 7636, ESPCI Paris, PSL Research University)

  • Jordi Ignés-Mullol

    (Universitat de Barcelona
    Universitat de Barcelona)

  • Francesc Sagués

    (Universitat de Barcelona
    Universitat de Barcelona)

Abstract

The role of boundary layers in conventional liquid crystals is commonly related to the mesogen anchoring on confining walls. In the classical view, anchoring enslaves the orientational field of the passive material under equilibrium conditions. In this work, we show that an active nematic can develop active boundary layers that topologically polarize the confining walls. We find that negatively-charged defects accumulate in the boundary layer, regardless of the wall curvature, and they influence the overall dynamics of the system to the point of fully controlling the behavior of the active nematic in situations of strong confinement. Further, we show that wall defects exhibit behaviors that are essentially different from those of their bulk counterparts, such as high motility or the ability to recombine with another defect of like-sign topological charge. These exotic behaviors result from a change of symmetry induced by the wall in the director field around the defect. Finally, we suggest that the collective dynamics of wall defects might be described in terms of a model equation for one-dimensional spatio-temporal chaos.

Suggested Citation

  • Jerôme Hardoüin & Claire Doré & Justine Laurent & Teresa Lopez-Leon & Jordi Ignés-Mullol & Francesc Sagués, 2022. "Active boundary layers in confined active nematics," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-34336-z
    DOI: 10.1038/s41467-022-34336-z
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    References listed on IDEAS

    as
    1. Tim Sanchez & Daniel T. N. Chen & Stephen J. DeCamp & Michael Heymann & Zvonimir Dogic, 2012. "Spontaneous motion in hierarchically assembled active matter," Nature, Nature, vol. 491(7424), pages 431-434, November.
    2. P. Guillamat & J. Ignés-Mullol & F. Sagués, 2017. "Taming active turbulence with patterned soft interfaces," Nature Communications, Nature, vol. 8(1), pages 1-8, December.
    3. Bohdan Senyuk & Qingkun Liu & Sailing He & Randall D. Kamien & Robert B. Kusner & Tom C. Lubensky & Ivan I. Smalyukh, 2013. "Topological colloids," Nature, Nature, vol. 493(7431), pages 200-205, January.
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