Dynamical clustering and phase separation in suspensions of self-propelled colloidal particles

Abstract

We study experimentally and numerically a (quasi) two dimensional colloidal suspension of self-propelled spherical particles. The particles are carbon-coated Janus particles, which are propelled due to diffusiophoresis in a near-critical water-lutidine mixture. At low densities, we find that the driving stabilizes small clusters. At higher densities, the suspension undergoes a phase separation into large clusters and a dilute gas phase. The same qualitative behavior is observed in simulations of a minimal model for repulsive self-propelled particles lacking any alignment interactions. The observed behavior is rationalized in terms of a dynamical instability due to the self-trapping of self-propelled particles.

8 pages including supplemental information, to appear in Phys. Rev. Lett

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• Statistical Mechanics and Hydrodynamics of Self-Propelled Hard Spheres
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• Motility-Induced Pinning in Flocking System with Discrete Symmetry
• Information transmission and signal permutation in active flow networks
• Influence of PEG on the Clustering of Active Janus Colloids
• Cybloids $-$ Creation and Control of Cybernetic Colloids
• Collective motion of granular matter subjected to swirling excitation
• Active Young-Dupré Equation: How Self-organized Currents Stabilize Partial Wetting
• Patchy landscapes promote stability of small groups
• Emergent clustering due to quorum sensing interactions in active matter
• Geometric and Nonequilibrium Criticality in Run-and-Tumble Particles with Competing Motility and Attraction
• Metastability on the steady states in a Fermi-like model of counterflowing particles
• Stability of interlocked self-propelled dumbbell clusters
• Diffusion coefficient and power spectrum of active particles with a microscopically reversible mechanism of self-propelling
• Acoustic signaling enables collective perception and control in active matter systems
• Vectorial active matter on the lattice: polar condensates and nematic filaments
• Active Phases for Particles on Resource Landscapes
• Fluctuation Theorems for Heat exchanges between passive and active baths
• Domain Growth Kinetics in Active Binary Mixtures
• Velocity Distribution and Diffusion of an Athermal Inertial Run-and-Tumble Particle in a Shear-Thinning Medium
• Mechanical inhibition of dissipation in a thermodynamically consistent active solid
• Nonequilibrium grand-canonical ensemble built from a physical particle reservoir
• Cluster dynamics in macroscopic photoactive particles
• On the effect of boundaries on noninteracting weakly active particles in different geometries
• The coherent motions of thermal active Brownian particles
• Active colloid with externally induced periodic bipolar motility and its cooperative motion
• Recovery of mechanical pressure in a gas of underdamped active dumbbells with Brownian noise
• Anti-Swarming: Structure and Dynamics of Repulsive Chemically Active Particles
• Transient Pattern Formation in an Active Matter Contact Poisoning Model
• Cluster tomography in percolation
• Fluctuating hydrodynamics of an autophoretic particle near a permeable interface
• Biased motility-induced phase separation: from chemotaxis to traffic jams
• Self-Aligning Active Agents with Inertia and Active Torque
• AMEP: The Active Matter Evaluation Package for Python
• Geometric view of stochastic thermodynamics for non-equilibrium steady states
• Transition-path sampling for Run-and-Tumble particles
• Confined active particles with spatially dependent Lorentz force: an odd twist to the "best Fokker-Planck approximation"
• Phenomenological model of motility by spatiotemporal modulation of active interactions
• Reinforcement Learning for Active Matter
• Demixing of two species via reciprocally concentration-dependent diffusivity
• Dynamics and rupture of doped Motility Induced Phase Peparation
• Differences in mechanical properties lead to anomalous phase separation in a model cell co-culture
• Synchronized Rotations of Active Particles on Chemical Substrates
• Theory for the Anomalous Phase Behavior of Inertial Active Brownian Particles
• Effect of speed fluctuations on the collective dynamics of active disks
• Emergence of oscillatory states of self-propelled colloids under optical confinement
• Physicochemical Hydrodynamics of Droplets out of Equilibrium: A Perspective Review
• Liquid-Hexatic-Solid phases in active and passive Brownian particles determined by stochastic birth and death events
• Conditions for the propulsion of a colloid surrounded by a mesoscale phase separation
• Thermodynamic nature of irreversibility in active matter
• Percolation transitions in the binary mixture of active Brownian particles with different softness
• Mobility-induced phase separation in a binary mixture of active Brownian particles
• Hyperuniformity of Weighted Particle Systems
• Generalized diffusion process with nonlocal interactions: Continuous time random walk model and stochastic resetting
• Occurrence of connected clusters in motility-induced phase-separated states of persistent active particles at zero temperature
• Active Ornstein-Uhlenbeck Model for Bacterial Heat Engines
• Experimental Modeling of Chiral Active Robots and a Minimal Model of Non-Gaussian Displacements
• Controlling local order of athermal self-propelled particles
• Shearing effects on the phase coarsening of binary mixtures using the Active Model B
• Motility-induced crystallization and rotating crystallites
• Spontaneous collective transport in a heat--bath
• The influence of active agent motility on SIRS epidemiological dynamics
• Pattern Formation and Flocking for Particles Near the Jamming Transition on Resource Gradient Substrates
• Anti-aligning Self-propelled Model of Two Species: Emergence of Self-organized Heterogeneous Aligned and Clustered Order
• Correlated escape of active particles across a potential barrier
• Bubble formation in active binary mixture model
• Jerky chiral active particles
• Kinetic Random-Field Nonreciprocal Ising Model
• Bidirectional Zigzag Growth from Clusters of Active Colloidal Shakers
• Energy landscape description of the clustering transition for active soft spheres
• Effective squirmer models for self-phoretic chemically active spherical colloids
• Clustering-induced self-propulsion of isotropic autophoretic particles
• Long-range influence of a pump on a critical fluid
• Scaling behavior of transient dynamics of vortex-like states in self-propelled particles
• Phase separation of self-propelled disks with ferromagnetic and nematic alignment
• Critical Motility-Induced Phase Separation in Three Dimensions is Consistent with Ising Universality
• Chiral flow in a binary mixture of two-dimensional active disks
• Dynamic control of the Bose-Einstein-like condensation transition in scalar active matter
• Dynamics of a simple model microswimmer in an anisotropic fluid: implications for alignment behavior and active transport in a nematic liquid crystal
• Density-Independent transient caging in the high-density phase of motility-induced phase separation
• Collective dynamics of macroscopic photoactive matter under alternating excitation patterns
• Riding the Wave: Polymers in Time-dependent Nonequilibrium Baths
• Collective treadmilling in fire ant rafts permits sustained protrusion growth
• Control of collective activity to crystallize an oscillator gas
• A minimal model for structure, dynamics, and tension of monolayered cell colonies
• A lattice Boltzmann model for self-diffusiophoretic particles near and at liquid-liquid interfaces
• Effective single component description of steady state structures of passive particles in an active bath
• Field driven cluster formation in two-dimensional colloidal binary mixtures
• Hydrodynamics of simple active liquids: the emergence of velocity correlations
• Optimal power and efficiency of odd engines
• Controlling Vortex Rotation in Dry Active Matter
• The autophoretic torus
• Morphology, Polarization Patterns, Compression, and Entropy Production in Phase-Separating Active Dumbbell Systems
• Active adaptolates: motility-induced percolating structures with an adaptive packing geometry
• Rolling at right angles: magnetic anisotropy enables dual-anisotropic active matter
• Derivation and Analysis of Amplitude Equation for Generalized AMB+ in Presence of Chemical Reaction