Issue 5, 2022

Particle anisotropy tunes emergent behavior in active colloidal systems

Abstract

Studies of active particle systems have demonstrated that particle anisotropy can impact the collective behavior of a system, motivating a systematic study. Here, we report a systematic computational investigation of the role of anisotropy in shape and active force director on the collective behavior of a two-dimensional active colloidal system. We find that shape and force anisotropy can combine to produce critical densities both lower and higher than those of disks. We demonstrate that changing particle anisotropy tunes what we define as a “collision efficiency” of inter-particle collisions in leading to motility-induced phase separation (MIPS) of the system. We use this efficiency to determine the relative critical density across systems. Additionally, we observe that local structure in phase-separated clusters is the same as the particle's equilibrium densest packing, suggesting a general connection between equilibrium behavior and non-equilibrium cluster structure of self-propelled anisotropic particles. In engineering applications for active colloidal systems, shape-controlled steric interactions such as those described here may offer a simple route for tailoring emergent behaviors.

Graphical abstract: Particle anisotropy tunes emergent behavior in active colloidal systems

Supplementary files

Article information

Article type
Paper
Submitted
17 May 2020
Accepted
28 Dec 2021
First published
04 Jan 2022

Soft Matter, 2022,18, 1044-1053

Particle anisotropy tunes emergent behavior in active colloidal systems

S. E. Moran, I. R. Bruss, P. W. A. Schönhöfer and S. C. Glotzer, Soft Matter, 2022, 18, 1044 DOI: 10.1039/D0SM00913J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements