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Active Atoms and Interstitials in Two-Dimensional Colloidal Crystals

Journal article
Authors K. Dietrich
Giovanni Volpe
M. N. Sulaiman
D. Renggli
I. Buttinoni
L. Isa
Published in Physical Review Letters
Volume 120
Issue 26
ISSN 0031-9007
Publication year 2018
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1103/PhysRevLett.120....
https://gup.ub.gu.se/file/207509
Keywords fluid interface, janus colloids, particles, surface, water, clusters, motion, Physics
Subject categories Physical Sciences

Abstract

We study experimentally and numerically the motion of a self-phoretic active particle in two-dimensional loosely packed colloidal crystals at fluid interfaces. Two scenarios emerge depending on the interactions between the active particle and the lattice: the active particle either navigates throughout the crystal as an interstitial or is part of the lattice and behaves as an active atom. Active interstitials undergo a run-and-tumble-like motion, with the passive colloids of the crystal acting as tumbling sites. Instead, active atoms exhibit an intermittent motion, stemming from the interplay between the periodic potential landscape of the passive crystal and the particle's self-propulsion. Our results constitute the first step towards the realization of non-close-packed crystalline phases with internal activity.

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