Chemically active Brownian particles with surface catalytic reactions may repel each other due to diffusiophoretic interactions in the reaction and product concentration fields. The system behavior can be described by a `chemical' coupling parameter Γc that compares the strength of diffusiophoretic repulsion to Brownian motion, and by a mapping to the classical electrostatic One Component Plasma (OCP) system. When confined to a constant-volume domain, Body-Centered Cubic crystals spontaneously form from random initial configurations when the repulsion is strong enough to overcome Brownian motion. Face-Centered Cubic crystals may also be stable. The `melting point' of the `liquid-to-crystal transition' occurs at Γc≈140 for both BCC and FCC lattices.
@article{arxiv.1711.01446,
title = {Anti-Swarming: Structure and Dynamics of Repulsive Chemically Active Particles},
author = {Wen Yan and John F. Brady},
journal= {arXiv preprint arXiv:1711.01446},
year = {2017}
}