Magnetically powered metachronal waves induce locomotion in self-assemblies

Abstract

When tiny soft ferromagnetic particles are placed along a liquid interface and exposed to a vertical magnetic field, the balance between capillary attraction and magnetic repulsion leads to self-organization into well-defined patterns. Here, we demonstrate experimentally that precessing magnetic fields induce metachronal waves on the periphery of these assemblies, similar to the ones observed in ciliates and some arthropods. The outermost layer of particles behaves like an array of cilia or legs whose sequential movement causes a net and controllable locomotion. This bioinspired many-particle swimming strategy is effective even at low Reynolds number, using only spatially uniform fields to generate the waves.

References in corpus (22)

• Double-slit photoelectron interference in strong-field ionization of the neon dimer
• The hydrodynamics of swimming microorganisms
• A Simplest Swimmer at Low Reynolds Number: Three Linked Spheres
• The 'Cheerios effect'
• Adaptive locomotion of artificial microswimmers
• Phototaxis of synthetic microswimmers in optical landscapes
• Hydrodynamic flow patterns and synchronization of beating cilia
• Finding the ciliary beating pattern with optimal efficiency
• Analytic results for the three-sphere swimmer at low Reynolds number
• Squirmers with swirl -- a model for $Volvox$ swimming
• Magnetic Propulsion of Self-Assembled Colloidal Carpets: Efficient Cargo Transport via a Conveyor-Belt Effect
• No many-scallop theorem: Collective locomotion of reciprocal swimmers
• Realization of the Najafi-Golestanian microswimmer
• Remote control of self-assembled microswimmers
• Magnetocapillary self-assemblies: locomotion and micromanipulation along a liquid interface
• Surface microswimmers, harnessing the interface to self-propel
• Generic flow profiles induced by a beating cilium
• Statics and dynamics of magnetocapillary bonds
• Magnetoelastic instability in soft thin films
• Optimal motion of triangular magnetocapillary swimmers
• Capillary assemblies in a rotating magnetic field
• Stability and dynamics of magnetocapillary interactions

Cited by in corpus (2)

• The Scallop Theorem and Swimming at the Mesoscale
• Lattice Boltzmann simulations of two linear microswimmers using the immersed boundary method