Tuning the Random Walk of Active Colloids: From Individual Run-And-Tumble to Dynamic Clustering

Hamid Karani*, Gerardo E. Pradillo, Petia M. Vlahovska

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Active particles such as swimming bacteria or self-propelled colloids spontaneously self-organize into large-scale dynamic structures. The emergence of these collective states from the motility pattern of the individual particles, typically a random walk, is yet to be probed in a well-defined synthetic system. Here, we report the experimental realization of tunable colloidal motion that reproduces run-And-Tumble and Lévy trajectories. We utilize the Quincke effect to achieve controlled sequences of repeated particle runs and random reorientations. We find that a population of these random walkers exhibit behaviors reminiscent of bacterial suspensions such as dynamic clusters and mesoscale turbulentlike flows.

Original languageEnglish (US)
Article number208002
JournalPhysical review letters
Volume123
Issue number20
DOIs
StatePublished - Nov 14 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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