Effective Interactions in Active Brownian Suspensions

Abstract

Active colloids exhibit persistent motion, which can lead to motility-induced phase separation (MIPS). However, there currently exists no microscopic theory to account for this phenomenon. We report a first-principles theory, free of fit parameters, for active spherical colloids, which shows explicitly how an effective many-body interaction potential is generated by activity and how this can rationalize MIPS. For a passively repulsive system the theory predicts phase separation and pair correlations in quantitative agreement with simulation. For an attractive system the theory shows that phase separation becomes suppressed by moderate activity, consistent with recent experiments and simulations, and suggests a mechanism for reentrant cluster formation at high activity.

10 pages, 3 figures

References in corpus (9)

• Self-motile colloidal particles: from directed propulsion to random walk
• Motility-Induced Phase Separation
• Statistical Mechanics of Interacting Run-and-Tumble Bacteria
• When are active Brownian particles and run-and-tumble particles equivalent? Consequences for motility-induced phase separation
• Diffusive transport without detailed balance in motile bacteria: Does microbiology need statistical physics?
• Phase behavior of a fluid with competing attractive and repulsive interactions
• Nonequilibrium equation of state in suspensions of active colloids
• Clustering and heterogeneous dynamics in a kinetic Monte-Carlo model of self-propelled hard disks
• Structural precursor to freezing: An integral equation study

Cited by in corpus (39)

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• Active escape dynamics: the effect of persistence on barrier crossing
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• Active Ornstein-Uhlenbeck model for self-propelled particles with inertia
• Phase separation and multibody effects in three-dimensional active Brownian particles
• Applicability of Effective Pair Potentials for Active Brownian Particles
• Clausius relation for active particles: what can we learn from fluctuations?
• Non-Equilibrium Surface Tension of the Vapour-Liquid Interface of Active Lennard-Jones Particles
• The Parental Active Model: a unifying stochastic description of self-propulsion
• Non-negative Interfacial Tension in Phase-Separated Active Brownian Particles
• Active Brownian particles at interfaces: An effective equilibrium approach
• Phase coexistence of active Brownian particles
• Active matter: quantifying the departure from equilibrium
• How irreversible are steady-state trajectories of a trapped active particle?
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• Effective equilibrium states in mixtures of active particles driven by colored noise
• Irreversibility in active matter: General framework for active Ornstein-Uhlenbeck particles
• Nonequilibrium phase behaviour from minimization of free power dissipation
• Mode-coupling theory for the steady-state dynamics of active Brownian particles
• Approach to equilibrium and non-equilibrium stationary distributions of interacting many-particle systems that are coupled to different heat baths
• Lane formation in a driven attractive fluid
• Hydrodynamic interactions dominate the structure of active swimmers' pair distribution functions
• Self-propelled particle in a nonconvex external potential: Persistent limit in one dimension
• Static Structure of Active Brownian Hard Disks
• Phase separation of active Brownian particles in two dimensions: Anything for a quiet life
• Three-body correlations and conditional forces in suspensions of active hard disks
• Theoretical approaches to the steady-state statistical physics of interacting dissipative units
• Escape rate of transiently active Brownian particle in one dimension
• The Influence of Particle Softness on Active Glassy Dynamics
• The Many Faces of Fluctuation-Dissipation Relations Out of Equilibrium
• Dynamic properties of quasi-confined colloidal hard-sphere liquids near the glass transition
• Tagged-particle motion in quasi-confined colloidal hard-sphere liquids
• Escape rate of an active Brownian particle in a rough potential
• Active chiral molecules in activity gradients