Clustering-induced self-propulsion of isotropic autophoretic particles

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • LadHyX, Ecole Polytechnique

Abstract

Self-diffusiophoretic particles exploit local concentration gradients of a solute species in order to self-propel at the micron scale. While an isolated chemically- and geometrically-isotropic particle cannot
swim, we show that it can achieve self-propulsion through interactions with other individually-non-motile particles by forming geometrically-anisotropic clusters via phoretic and hydrodynamic interactions. This result identifies a new route to symmetry-breaking for the concentration field and to self-propulsion, that is not based on an anisotropic design, but on the collective dynamics of identical and homogeneous active particles. Using full numerical simulations as well as theoretical modelling of the clustering process, the statistics of the propulsion properties are obtained for arbitrary initial arrangement of the particles. The robustness of these results to thermal noise, and more generally the effect of Brownian motion of the particles, is also discussed.

Details

Original languageEnglish
Pages (from-to)7155-7173
JournalSoft Matter
Volume14
Issue number35
Early online date30 Jul 2018
Publication statusPublished - 21 Sep 2018