Self-motile colloidal particles: from directed propulsion to random walk

Abstract

The motion of an artificial micro-scale swimmer that uses a chemical reaction catalyzed on its own surface to achieve autonomous propulsion is fully characterized experimentally. It is shown that at short times, it has a substantial component of directed motion, with a velocity that depends on the concentration of fuel molecules. At longer times, the motion reverts to a random walk with a substantially enhanced diffusion coefficient. Our results suggest strategies for designing artificial chemotactic systems.

This is an experimental paper, due to appear in Phys. Rev. Lett. (2007)

References in corpus (3)

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• A Simplest Swimmer at Low Reynolds Number: Three Linked Spheres

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• A simple model system for self-propelled particles passing a bottleneck
• A geometric condition for robot-swarm cohesion and cluster-flock transition
• Self-avoidant memory effects on enhanced diffusion in a stochastic model of environmentally responsive swimming droplets
• Aging or DEAD: origin of the non-monotonic response to weak self-propulsion in active glasses
• Mode-Switching of Active Droplets in Macromolecular Solutions
• Magnetized granular particles running and tumbling on $S^1$
• Collective dynamics and rheology of confined phoretic suspensions
• Drift induced by dissipation
• Harmonically trapped inertial run-and-tumble particle in one dimension
• Self-diffusive dynamics of active Brownian particles at moderate densities
• Fluctuating hydrodynamics of active particles interacting via taxis and quorum sensing: static and dynamics
• Mechanochemical Active Ratchet
• Nematic Torques in Scalar Active Matter: when Fluctuations Favor Polar Order and Persistence
• Domain Growth in the Active Model B: Critical and Off-critical Composition
• Activity-assisted barrier-crossing of self-propelled colloids over parallel microgrooves
• Crystallization and flow in active patch systems
• Inertial Dynamics of Run-and-Tumble Particle
• Optothermal pulling, trapping, and assembly of colloids using nanowire plasmons
• Phoretic flow induced by asymmetric confinement
• Impact of non-reciprocal interactions on colloidal self-assembly with tunable anisotropy
• Clustering of chemically propelled nanomotors in chemically active environments
• Towards Stirling engine using an optically confined particle subjected to asymmetric temperature profile
• Mesoscopic simulations of anisotropic chemically-powered nanomotors
• Chiral active systems near a substrate: Emergent damping length controlled by fluid friction
• Reentrant condensation transition in a model of driven scalar active matter with diffusivity edge
• Shape-shifting droplet networks
• RMPCDMD: Simulations of colloids with coarse-grained hydrodynamics, chemical reactions and external fields
• Focusing by blocking: repeatedly generating central density peaks in self-propelled particle systems by exploiting diffusive processes
• Squeezed in three dimensions, moving in two: Hydrodynamic theory of 3D incompressible easy-plane polar active fluids
• Super-Gaussian, super-diffusive transport of multi-mode active matter
• Orientational dynamics of a heated Janus particle
• Stokes traction on an active particle
• An equation of state for active matter
• Non-ideal rheology of semidilute bacterial suspensions
• Polarization and dynamic phases of aligning active matter in periodic obstacle arrays
• Transport of molecules via polymerization in chemical gradients
• Comparison of time reversal symmetric and asymmetric nano-swimmers oriented with an electric field in soft matter
• Anisotropic active Brownian particle with a fluctuating propulsion force
• Janus microswimmers are poor hydrodynamic mixers
• Active-Passive Brownian Particle in Two Dimensions
• Obtaining efficient collisional engines via velocity dependent drivings
• Active particles confined in deformable droplets
• Spontaneous chiralization of polar active colloids
• Long-wavelength instabilities in a system of interacting active particles
• Self-organisation of auto-phoretic suspensions in confined shear flows
• Control of diffusion of nano-particles in an optical vortex lattice
• Diffusion coefficient and power spectrum of active particles with a microscopically reversible mechanism of self-propelling
• Re-entrant bimodality in spheroidal chiral swimmers in shear flow
• Active dipolar spheroids in shear flow and transverse field: Population splitting, cross-stream migration and orientational pinning
• Active Matter on Asymmetric Substrates
• Active Transport of Cargo-Carrying and Interconnected Chiral Particles
• Chirality Reversing Active Brownian Motion in Two Dimensions
• Synthetic Quorum Sensing and Absorbing Phase Transitions in Colloidal Active Matter
• Limiting propulsion of ionic microswimmers
• Diffusion dynamics of an overdamped active ellipsoidal particle in two dimensions
• Particle-Wall Alignment Interaction and Active Brownian Diffusion Through Narrow Channels
• AMEP: The Active Matter Evaluation Package for Python
• Transmission of mobility via cooperative mechanisms in soft active matter
• Three-dimensional chiral active Ornstein-Uhlenbeck model for helical motion of microorganisms
• Anti-Swarming: Structure and Dynamics of Repulsive Chemically Active Particles
• Not-so-glass-like Caging and Fluctuations of an Active Matter Model
• Active colloidal particles in emulsion droplets: A model system for the cytoplasm
• Rotational motion of dimers of Janus particles
• Phenomenological model of motility by spatiotemporal modulation of active interactions
• Emergence of oscillatory states of self-propelled colloids under optical confinement
• Transition-path sampling for Run-and-Tumble particles
• Nanoswimmers in a ratchet potential: Effects of a transverse rocking force
• Inverted Sedimentation of Active Particles in Unbiased ac Fields
• Dynamically stable optical trapping of thermophoretically active Janus colloids
• Dynamic phase transition induced by active molecules simulating a facilitation mechanism in a supercooled liquid
• Synchronized Rotations of Active Particles on Chemical Substrates
• Chemomechanical motility modes of partially wetting liquid droplets
• Reinforcement Learning for Active Matter
• Geometric view of stochastic thermodynamics for non-equilibrium steady states
• Turning catalytically active pores into active pumps
• Langevin equations and a geometric integration scheme for the overdamped limit of rotational Brownian motion of axisymmetric particles
• Long time behavior of run-and-tumble particles in two dimensions
• A Deep Reinforcement Learning Architecture for Multi-stage Optimal Control
• Floor- or ceiling-sliding for chemically active, gyrotactic, sedimenting Janus particles
• Efficient Navigation of Colloidal Robots in an Unknown Environment via Deep Reinforcement Learning
• Nonequilibrium dynamical structure of a dilute suspension of active particles in a viscoelastic fluid
• Fluid transport by active elastic membranes
• Diffusion of an Active Particle Bound to a Generalized Elastic Model: Fractional Langevin Equation
• Coupled Interfacial Phenomena Suppress Propulsion in Catalytic Janus Colloids
• Target search by active particles
• Most probable paths for active Ornstein-Uhlenbeck particles
• Exact Results in Stochastic Processes with Division, Death, and Diffusion: Spatial Correlations, Marginal Entropy Production, and Macroscopic Currents
• Fluctuating Hydrodynamics Describes Transport in Cellular Aggregates
• Mobility-induced phase separation in a binary mixture of active Brownian particles
• Active control of transport through nanopores
• Ewald summing irreducible components of flow around active particles
• The matter/life nexus in biological cells
• Active Brownian motion of an asymmetric rigid particle
• Jerky chiral active particles
• Escape rate of an active Brownian particle in a rough potential
• Thermodynamic uncertainty relation for systems with active Ornstein-Uhlenbeck particles
• Mechanically-driven Stem Cell Separation in Tissues caused by Proliferating Daughter Cells
• Crossover dynamics and non-Gaussian fluctuations in inertial active chains
• Phase separation of chemokinetic active particles
• Dynamical metastability and re-entrant localization of trapped active elements with speed and orientation fluctuations
• Effective squirmer models for self-phoretic chemically active spherical colloids
• Light-Activated Self-thermophoretic Janus Nanopropellers
• Free chiral self-propelled robots compared to active Brownian circle swimmers
• Entropy production in active Rouse polymers
• Jamming of active particles in narrow pores: Implications for ratchet effect and diffusion coefficient
• Clustering-induced self-propulsion of isotropic autophoretic particles
• Automated decision-making by chemical echolocation in active droplets
• Effective flows across diffusio-phoretic membranes
• Influences of transversely-isotropic rheology and translational diffusion on the stability of active suspensions
• Active adaptolates: motility-induced percolating structures with an adaptive packing geometry
• Energetics-based model for a diffusiophoretic motion of a deformable droplet
• Filamentous Active Matter: Band Formation, Bending, Buckling, and Defects
• Activity induced delocalization and freezing in self-propelled systems
• Long-ranged velocity correlations in dense systems of self-propelled particles
• Density-Independent transient caging in the high-density phase of motility-induced phase separation
• Riding the Wave: Polymers in Time-dependent Nonequilibrium Baths
• Individual particle persistence antagonizes global ordering in populations of nematically-aligning self-propelled particles
• Generalized squirming motion of a sphere
• Circular motion subject to external alignment under active driving: nonlinear dynamics and the circle map
• From Attraction to Repulsion: Emergent Interactions in Harmonically Coupled Active Binary System
• The non-equilibrium thermodynamics of active suspensions
• Beyond the Markovian limit: Exact solutions for active motion in a power-law viscoelastic bath
• Programmable Persistent Random Walks in Active Brownian Particles Govern Emergent Dynamics
• Autophoresis of a Janus particle near a planar wall: a lubrication limit
• The autophoretic torus
• Universal framework for the long-time position distribution of free active particles
• Onsager reciprocal relations and chemo-mechanical coupling for chemically-active colloids
• Active chiral molecules in activity gradients
• Micro/Nano Motor Navigation and Localization via Deep Reinforcement Learning
• Nematic Colloidal Swarms Assembled and Transported on Photosensitive Surfaces
• Instability and self-propulsion of flexible autophoretic filaments
• Morphological Effects on Bacterial Brownian Motion: Validation of a Chiral Two-Body Model
• Boundary layers, transport and universal distribution in boundary driven active systems
• Shape-specific fluctuations of an active colloidal interface
• Shape-asymmetry and flexibility in active cross-stream migration in nonuniform shear
• A facilitation-induced fluidization transition in supercooled water triggered by a few active molecules
• Non-Gaussian Normal Diffusion in Low Dimensional Systems
• A lattice Boltzmann model for self-diffusiophoretic particles near and at liquid-liquid interfaces
• Simulation of a flat folding nano-swimmer confined in a nanopore
• Non-reciprocal interactions between condensates in chemically active mixtures
• Harnessing confinement and driving to tune active particle dynamics