Artificial rheotaxis

Jérémie Palacci, Stefano Sacanna, Anaïs Abramian, Jérémie Barral, Kasey Hanson, Alexander Y. Grosberg, David J. Pine, Paul M. Chaikin

Research output: Contribution to journalArticle

Abstract

Motility is a basic feature of living microorganisms, and how it works is often determined by environmental cues. Recent efforts have focused on developing artificial systems that can mimic microorganisms, in particular their self-propulsion. We report on the design and characterization of synthetic self-propelled particles that migrate upstream, known as positive rheotaxis. This phenomenon results from a purely physical mechanism involving the interplay between the polarity of the particles and their alignment by a viscous torque. We show quantitative agreement between experimental data and a simple model of an overdamped Brownian pendulum. The model notably predicts the existence of a stagnation point in a diverging flow. We take advantage of this property to demonstrate that our active particles can sense and predictably organize in an imposed flow. Our colloidal system represents an important step toward the realization of biomimetic microsystems with the ability to sense and respond to environmental changes.

Original languageEnglish (US)
Article numbere1400214
JournalScience Advances
Volume1
Issue number4
DOIs
StatePublished - May 2015

ASJC Scopus subject areas

  • General

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    Palacci, J., Sacanna, S., Abramian, A., Barral, J., Hanson, K., Grosberg, A. Y., Pine, D. J., & Chaikin, P. M. (2015). Artificial rheotaxis. Science Advances, 1(4), [e1400214]. https://doi.org/10.1126/sciadv.1400214