Tractionless Self-Propulsion of Active Drops

Research output: Contribution to journalArticle (Academic Journal)

2 Citations (Scopus)
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Abstract

We report on a new mode of self-propulsion exhibited by compact drops of active liquids on a substrate which, remarkably, is tractionless, i.e., which imparts no mechanical stress locally on the surface. We show, both analytically and by numerical simulation, that the equations of motion for an active nematic drop possess a simple self-propelling solution, with no traction on the solid surface and in which the direction of motion is controlled by the winding of the nematic director field across the drop height. The physics underlying this mode of motion has the same origins as that giving rise to the zero viscosity observed in bacterial suspensions. This topologically protected tractionless self-propusion provides a robust physical mechanism for efficient cell migration in crowded environments like tissues.

Original languageEnglish
Article number248006 (2019)
Number of pages6
JournalPhysical Review Letters
Volume123
DOIs
Publication statusPublished - 13 Dec 2019

Structured keywords

  • BrisSynBio
  • Bristol BioDesign Institute

Keywords

  • Synthetic Biology

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