Elasticity Induced Force Reversal Between Active Spinning Particles in Dense Passive Media

Abstract

The self-organization of active particles is governed by their dynamic effective interactions. Such interactions are controlled by the medium in which such active agents reside. Here, we study the interactions between active agents in a dense non-active medium. Our system consists of actuated spinning (active) particles embedded in a dense monolayer of passive (non-active) particles. We demonstrate that the presence of the passive monolayer alters dramatically the properties of the system and results in a reversal of the forces between active spinning particles from repulsive to attractive. The origin of such reversal is due to the coupling between the active stresses and elasticity of the system. This discovery provides a new mechanism for the interaction between active agents in complex and structured media, opening up new opportunities to tune the interaction range and directionality via the mechanical properties of the medium.

References in corpus (11)

• Fluid dynamics and noise in bacterial cell-cell and cell-surface scattering
• Activity-induced phase separation and self-assembly in mixtures of active and passive particles
• Lattice Boltzmann simulations of soft matter systems
• Pattern formation in self-propelled particles with density-dependent motility
• Negative interfacial tension in phase-separated active suspensions
• Statistical Mechanics of the Fluctuating Lattice Boltzmann Equation
• Tunable long range forces mediated by self-propelled colloidal hard spheres
• Purely hydrodynamic ordering of rotating disks at a finite Reynolds number
• Interface mediated interactions between particles -- a geometrical approach
• Avalanches mediate crystallization in a hard-sphere glass
• Micropropulsion and microrheology in complex fluids via symmetry breaking

Cited by in corpus (12)

• Spatiotemporal order and emergent edge currents in active spinner materials
• Time-(ir)reversibility in active matter: from micro to macro
• Robust boundary flow in chiral active fluid
• Topological defects in solids with odd elasticity
• Structural nonequilibrium forces in driven colloidal systems
• Hot Particles Attract in a Cold Bath
• Inertial clustering and emergent phase separation of spherical spinners
• Fluctuation Spectra and Force Generation in Non-equilibrium Systems
• Collective Flows Drive Cavitation in Spinner Monolayers
• Singular density correlations in chiral active fluids in three dimensions
• Programmable transport of rotating particles in obstacle arrays
• Chiral Active Matter