Sedimentation of self-propelled Janus colloids: polarization and pressure
arXiv:1805.08681 · doi:10.1088/1367-2630/aae732
Abstract
We study experimentally-using Janus colloids-and theoretically-using Active Brownian Particles- the sedimentation of dilute active colloids. We first confirm the existence of an exponential density profile. We show experimentally the emergence of a polarized steady state outside the effective equilibrium regime, i.e. when v_s is not much smaller than the propulsion speed. The experimental distribution of polarization is very well described by the theoretical prediction with no fitting parameter. We then discuss and compare three different definitions of pressure for sedimenting particles: the weight of particles above a given height, the flux of momentum and active impulse, and the force density measured by pressure gauges.
References in corpus (23)
- Athermal Phase Separation of Self-Propelled Particles with no Alignment
- Sedimentation of active colloidal suspensions
- Pressure is not a state function for generic active fluids
- Langevin Equation for the Density of a System of Interacting Langevin Processes
- Pressure and Phase Equilibria in Interacting Active Brownian Spheres
- Sedimentation, trapping, and rectification of dilute bacteria
- A self-propelled particle in an external potential: is there an effective temperature?
- Active Brownian Particles and Run-and-Tumble Particles: a Comparative Study
- Nonequilibrium equation of state in suspensions of active colloids
- Active colloidal suspensions exhibit polar order under gravity
- Virial pressure in systems of active Brownian particles
- Run-and-tumble particles with hydrodynamics: sedimentation, trapping and upstream swimming
- Run-and-Tumble Dynamics of Self-Propelled Particles in Confinement
- Anomalous Thermomechanical Properties of a Self-propelled Colloidal Fluid
- Active vs. Passive Hard Disks Against a Membrane : Mechanical Pressure and Instability
- Swim pressure on walls with curves and corners
- Ideal bulk pressure of active Brownian particles
- Mechanical pressure and momentum conservation in dry active matter
- Steady-state distributions of ideal active Brownian particles under confinement and forcing
- Pressure of a gas of underdamped active dumbbells
- Mesoscopic virial equation for nonequilibrium statistical mechanics
- Generalized Archimedes' principle in active fluids
- How statistical forces depend on thermodynamics and kinetics of driven media
Cited by in corpus (29)
- Time-(ir)reversibility in active matter: from micro to macro
- Characterization of MIPS in a suspension of repulsive Active Brownian Particles through dynamical features
- Surface Tensions between Active Fluids and Solid Interfaces: bare vs dressed
- Inclusions, Boundaries and Disorder in Scalar Active Matter
- Capillary action in scalar active matter
- Designing, Synthesizing and Modeling Active Fluids
- Polarization-Density Patterns of Active Particles in Motility Gradients
- Active particles with polar alignment in ring-shaped confinement
- Active interface polarization is a state function
- Bacterial activity hinders particle sedimentation
- Spectral density of individual trajectories of an active Brownian particle
- Flocking in One Dimension: Asters and Reversals
- Resonant diffusion of a gravitactic circle swimmer
- Motility-induced clustering of active particles under soft confinement
- Colloidal Brazil nut effect in microswimmer mixtures induced by motility contrast
- Ratchet-induced variations in bulk states of an active ideal gas
- Fluctuating hydrodynamics of active particles interacting via taxis and quorum sensing: static and dynamics
- Activity-assisted barrier-crossing of self-propelled colloids over parallel microgrooves
- Anisotropic run-and-tumble-turn dynamics
- Stationary particle currents in sedimenting active matter wetting a wall
- Re-entrant percolation in active Brownian hard disks
- Sedimentation dynamics of passive particles in dilute bacterial suspensions: emergence of bioconvection
- Active crystallization from power functional theory
- Premelting controlled active matter in ice
- Wetting by active fluids
- Phase-separation during sedimentation of dilute bacterial suspensions
- Inverted Sedimentation of Active Particles in Unbiased ac Fields
- Floor- or ceiling-sliding for chemically active, gyrotactic, sedimenting Janus particles
- Expanding Active Matter to the Third Dimension: Exploring Short and Long-Range Particle-Wall Interactions