Large scale zigzag pattern emerging from circulating active shakers
arXiv:2402.00493 · doi:10.1103/PhysRevLett.131.068301
Abstract
We report the emergence of large zigzag bands in a population of reversibly actuated magnetic rotors that behave as active shakers, namely squirmers that shake the fluid around them without moving. The shakers collectively organize into dynamic structures displaying self-similar growth, and generate topological defects in form of cusps that connect vortices of rolling particles with alternating chirality. By combining experimental analysis with particle-based simulation, we show that the special flow field created by the shakers is the only ingredient needed to reproduce the observed spatiotemporal pattern. We unveil a self-organization scenario in a collection of driven particles in an viscoelastic medium emerging from the reduced particle degrees of freedom, as here the frozen orientational motion of the shakers.
References in corpus (15)
- The hydrodynamics of swimming microorganisms
- Nonlinear Elasticity in Biological Gels
- The Physics of the Colloidal Glass Transition
- Rheology of Active-Particle Suspensions
- Elasticity-mediated self-organization and colloidal interactions of solid spheres with tangential anchoring in a nematic liquid crystal
- Undulatory swimming in viscoelastic fluids
- Patterning active materials with addressable soft interfaces
- Dynamics of self-propelled Janus particles in viscoelastic fluids
- Locomotion of helical bodies in viscoelastic fluids: enhanced swimming at large helical amplitudes
- Theory of swimming filaments in viscoelastic media
- Optical tweezers microrheology maps the dynamics of strain-induced local inhomogeneities in entangled polymers
- Emergence of colloidal patterns in AC electrical fields
- Colloidal Surfaces with Boundaries, Apex Boojums and Nested Elastic Self-Assembly of Nematic Colloids
- Collective hydrodynamic transport of magnetic microrollers
- Viscoelastic levitation