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Emergent stereoselective interactions and self-recognition in polar chiral active ellipsoids

Arora, P and Sood, AK and Ganapathy, R (2021) Emergent stereoselective interactions and self-recognition in polar chiral active ellipsoids. In: Science Advances, 7 (9).

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Official URL: https://doi.org/10.1126/sciadv.abd0331


In many active matter systems, particle trajectories have a well-defined handedness or chirality. Whether such chiral activity can introduce stereoselective interactions between particles is not known. Here, we developed a strategy to tune the nature of chiral activity of three-dimensionally printed granular ellipsoids without altering their shape or size. In vertically agitated monolayers of these particles, we observed two types of dimers form depending on the chirality of the pairing monomers. Heterochiral dimers moved collectively as a single achiral active unit, while homochiral ones formed a translationally immobile spinner. In active racemic mixtures, the former was more abundant than the latter, indicating that interactions were stereoselective. Through dimer lifetime measurements, we further provide evidence for chiral self-recognition in mixtures of particles with different chiral activities. We lastly show that, at fixed particle number density, changing the net chirality of a dense active liquid fundamentally alters the nature of collective relaxation. Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

Item Type: Journal Article
Publication: Science Advances
Publisher: American Association for the Advancement of Science
Additional Information: The copyright for this article belongs to Authors
Keywords: Chirality; Mixtures; Stereoselectivity, Homochiral; Lifetime measurements; Particle number density; Particle trajectories; Racemic mixtures; Self-recognition; Stereo-selective, Dimers
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 20 Apr 2021 11:21
Last Modified: 20 Apr 2021 11:21
URI: http://eprints.iisc.ac.in/id/eprint/68522

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