Wetting transition of active Brownian particles on a thin membrane

Abstract

We study non-equilibrium analogues of surface phase transitions in a minimal model of active particles in contact with a purely repulsive potential barrier that mimics a thin porous membrane. Under conditions of bulk motility-induced phase separation, the interaction strength ${\epsilon }_w$ of the barrier controls the affinity of the dense phase for the barrier region. We uncover clear signatures of a wetting phase transition as ${\epsilon }_w$ is varied. In common with its equilibrium counterpart, the character of this transition depends on the system dimensionality: a continuous transition with large density fluctuations and gas bubbles is uncovered in 2d while 3d systems exhibit a sharp transition absent of large correlations.

References in corpus (31)

• Active Particles in Complex and Crowded Environments
• Motility-Induced Phase Separation
• Physics of Microswimmers - Single Particle Motion and Collective Behavior
• Swimming in circles: Motion of bacteria near solid boundaries
• Emergence of macroscopic directed motion in populations of motile colloids
• Sedimentation of active colloidal suspensions
• Phase behaviour of active Brownian particles: The role of dimensionality
• Full phase diagram of active Brownian disks: from melting to motility-induced phase separation
• Cooperative Motion of Active Brownian Spheres in Three-Dimensional Dense Suspensions
• Dynamics of a self-propelled particle in a harmonic trap
• How to capture active particles
• Negative interfacial tension in phase-separated active suspensions
• Generalized Thermodynamics of Phase Equilibria in Scalar Active Matter
• Tunable long range forces mediated by self-propelled colloidal hard spheres
• Motility-Induced Microphase and Macrophase Separation in a Two-Dimensional Active Brownian Particle System
• The molecular structure of the interface between water and a hydrophobic substrate is liquid-vapor like
• Critical behavior of active Brownian particles
• Phase Diagram of Active Brownian Spheres: Crystallization and the Metastability of Motility-Induced Phase Separation
• A unified description of hydrophilic and superhydrophobic surfaces in terms of the wetting and drying transitions of liquids
• Microscopic Origins of the Swim Pressure and the Anomalous Surface Tension of Active Matter
• Phase separation and multibody effects in three-dimensional active Brownian particles
• Critical Drying of Liquids
• Non-negative Interfacial Tension in Phase-Separated Active Brownian Particles
• Collective forces in scalar active matter
• Drying and Wetting Transitions of a Lennard-Jones Fluid: Simulations and Density Functional Theory
• Wetting Transitions Displayed by Persistent Active Particles
• Coexistence of active Brownian discs: Van der Waals theory and analytical results
• Morphological transitions of active Brownian particle aggregates on porous walls
• Universality of active wetting transitions
• Dewetting and Spreading Transitions for Active Matter on Random Pinning Substrates
• Apparent first-order wetting and anomalous scaling in the two-dimensional Ising model