Active Atoms and Interstitials in Two-Dimensional Colloidal Crystals

Physical Review Letters
Kilian DietrichLucio Isa

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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Citations

Sep 25, 2018·Soft Matter·Alvaro Domínguez, Mihail N Popescu
Nov 24, 2018·The European Physical Journal. E, Soft Matter·G GrosjeanN Vandewalle
Sep 12, 2020·Physical Review Letters·Kilian DietrichLucio Isa
Jun 6, 2019·Nature Communications·Helena Massana-CidPietro Tierno
Jul 31, 2019·Nature Communications·Sophie RamananarivoJeremie Palacci
Sep 3, 2020·The Journal of Chemical Physics·S A MalloryA Cacciuto
Mar 9, 2021·The European Physical Journal. E, Soft Matter·Martin WittmannJuliane Simmchen
Jul 31, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Jacopo Vialetto, Manos Anyfantakis
Feb 26, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Jiayi DengKathleen J Stebe

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