The stability phase diagram of active Brownian particles

Abstract

Phase separation in a low-density gas-like phase and a high-density liquid-like one is a common trait of biological and synthetic self-propelling particles' systems. The competition between motility and stochastic forces is assumed to fix the boundary between the homogeneous and the phase-separated phase. Here we demonstrate that motility does also promote the homogeneous phase allowing particles to resolve their collisions. This new understanding allows quantitatively predicting the spinodal-line of hard self-propelling Brownian particles, the prototypical model exhibiting a motility induced phase separation. Furthermore, we demonstrate that frictional forces control the physical process by which motility promotes the homogeneous phase. Hence, friction emerges as an experimentally variable parameter to control the motility induced phase diagram.

arXiv commentPhysical Review Research, to appear. In the revised manuscript, the theoretical model is validated against simulations spanning a larger range of parameters

References in corpus (24)

• Active Particles in Complex and Crowded Environments
• Motility-Induced Phase Separation
• Dynamical clustering and phase separation in suspensions of self-propelled colloidal particles
• Athermal Phase Separation of Self-Propelled Particles with no Alignment
• Active Brownian Particles. From Individual to Collective Stochastic Dynamics
• When are active Brownian particles and run-and-tumble particles equivalent? Consequences for motility-induced phase separation
• Phase behaviour of active Brownian particles: The role of dimensionality
• Hydrodynamics determines collective motion and phase behavior of active colloids
• Pressure and Phase Equilibria in Interacting Active Brownian Spheres
• Full phase diagram of active Brownian disks: from melting to motility-induced phase separation
• Brownian motion of a self-propelled particle
• Microscopic theory for the phase separation of self-propelled repulsive disks
• Effective Cahn-Hilliard equation for the phase separation of active Brownian particles
• A unified description of the rheology of hard-particle suspensions
• Freezing and phase separation of self-propelled disks
• Towards a 'Thermodynamics' of Active Matter
• Cooperative Motion of Active Brownian Spheres in Three-Dimensional Dense Suspensions
• Roughness-dependent tribology effects on discontinuous shear thickening
• Thermodynamic phases in two-dimensional active matter
• Clustering and heterogeneous dynamics in a kinetic Monte-Carlo model of self-propelled hard disks
• A classical nucleation theory description of active colloid assembly
• Active dumbbells: dynamics and morphology in the coexisting region
• Discontinuous shear-thickening in Brownian suspensions
• Phase separation of self-propelled ballistic particles

Cited by in corpus (13)

• Phase Diagram of Active Brownian Spheres: Crystallization and the Metastability of Motility-Induced Phase Separation
• Collective dynamics of active Brownian particles in three spatial dimensions: a predictive field theory
• Designing, Synthesizing and Modeling Active Fluids
• Hydrodynamic effects on the liquid-hexatic transition of active colloids
• Motility induced phase separation of deformable cells
• Phase separation of active Brownian particles on curved surfaces
• Interplay between jamming and MIPS in persistent self-propelling particles
• Phase behaviour and dynamics of three-dimensional active dumbbell systems
• A geometric condition for robot-swarm cohesion and cluster-flock transition
• Frictional Active Brownian Particles
• Self-propulsion and self-navigation: Activity is a precursor to jamming
• AMEP: The Active Matter Evaluation Package for Python
• Critical Motility-Induced Phase Separation in Three Dimensions is Consistent with Ising Universality