Exact phoretic interaction of two chemically-active particles
Abstract
We study the nonequilibrium interaction of two isotropic chemically-active particles taking into account the exact near-field chemical interactions as well as hydrodynamic interactions. We identify regions in the parameter space wherein the dynamical system describing the two particles can have a fixed-point---a phenomenon that cannot be captured under the far-field approximation. We find that due to near-field effects, the particles may reach a stable equilibrium at a nonzero gap size, or make a complex that can dissociate in the presence of sufficiently strong noise. We explicitly show that the near-field effects are originated from a self-generated neighbor-reflected chemical gradient, similar to interactions of a self-propelling phoretic particle and a flat substrate.
Cite
@article{arxiv.2001.07576,
title = {Exact phoretic interaction of two chemically-active particles},
author = {Babak Nasouri and Ramin Golestanian},
journal= {arXiv preprint arXiv:2001.07576},
year = {2020}
}