Active Brownian particles at interfaces: An effective equilibrium approach
Department of Physics, University of Fribourg - CH-1700 Fribourg, Switzerland
Received: 21 January 2016
Accepted: 29 June 2016
A simple theoretical approach is used to investigate active colloids at the free interface and near repulsive substrates. We employ dynamical density functional theory to determine the steady-state density profiles in an effective equilibrium system (Farage T. F. F. et al., Phys. Rev. E, 91 (2015) 042310). In addition to the known accumulation at surfaces, we predict wetting and drying transitions at a flat repulsive wall and capillary condensation and evaporation in a slit pore. These new phenomena are closely related to the motility-induced phase separation (MIPS) in the bulk.
PACS: 82.70.Dd – Colloids / 64.75.Gh – Phase separation and segregation in model systems (hard spheres, Lennard-Jones, etc.) / 61.20.Gy – Theory and models of liquid structure
© EPLA, 2016