Force generation in confined active fluids: The role of microstructure
arXiv:2205.05619 · doi:10.1103/PhysRevLett.129.058001
Abstract
We experimentally determine the force exerted by a bath of active particles onto a passive probe as a function of its distance to a wall and compare it to the measured averaged density distribution of active particles around the probe. Within the framework of an active stress, we demonstrate that both quantities are - up to a factor - directly related to each other. Our results are in excellent agreement with a minimal numerical model and confirm a general and system-independent relationship between the microstructure of active particles and transmitted forces.
arXiv commentAccepted for the publication in Physical Review Letters, see https://journals.aps.org/prl/accepted/8b078YcbZb419475998267a260895e617cab4a01e
References in corpus (26)
- Active Particles in Complex and Crowded Environments
- Self-motile colloidal particles: from directed propulsion to random walk
- Dynamical clustering and phase separation in suspensions of self-propelled colloidal particles
- A bacterial ratchet motor
- Microswimmers in Patterned Environments
- Pressure is not a state function for generic active fluids
- The Lennard-Jones potential: when (not) to use it
- Self-Starting Micromotors in a Bacterial Bath
- Generalized energy equipartition in harmonic oscillators driven by active baths
- Nonequilibrium equation of state in suspensions of active colloids
- Tunable long range forces mediated by self-propelled colloidal hard spheres
- Detention times of microswimmers close to surfaces: Influence of hydrodynamic interactions and noise
- Casimir Effect in Active Matter Systems
- The force on a body in active matter
- Active vs. Passive Hard Disks Against a Membrane : Mechanical Pressure and Instability
- Curvature Induced Activation of a Passive Tracer in an Active Bath
- Tuning the motility and directionality of self-propelled colloids
- Microscopic Origins of the Swim Pressure and the Anomalous Surface Tension of Active Matter
- Active Brownian particles near straight or curved walls: Pressure and boundary layers
- Collective forces in scalar active matter
- Effective interactions between inclusions in an active bath
- Coexistence of active Brownian discs: Van der Waals theory and analytical results
- Depletion forces on circular and elliptical obstacles induced by active matter
- Generalized Archimedes' principle in active fluids
- Transient coarsening and the motility of optically heated Janus colloids in a binary liquid mixture
- Vorticity Determines the Force on Bodies Immersed in Active Fluids