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Clustering-induced self-propulsion of isotropic autophoretic particles. | LitMetric

Clustering-induced self-propulsion of isotropic autophoretic particles.

Soft Matter

LadHyX - Département de Mécanique, Ecole Polytechnique - CNRS, 91128 Palaiseau, France.

Published: September 2018

AI Article Synopsis

Article 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.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6136269PMC
http://dx.doi.org/10.1039/c8sm00690cDOI Listing

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