Spontaneous polarization and locomotion of an active particle with surface-mobile enzymes

Abstract

We examine a mechanism of locomotion of active particles whose surface is uniformly coated with mobile enzymes. The enzymes catalyze a reaction that drives phoretic flows but their homogeneous distribution forbids locomotion by symmetry. We find that the ability of the enzymes to migrate over the surface combined with self-phoresis can lead to a spontaneous symmetry breaking instability whereby the homogeneous distribution of enzymes polarizes and the particle propels. The instability is driven by the advection of enzymes by the phoretic flows and occurs above a critical Péclet number. The transition to polarized motile states occurs via a supercritical or subcritical pitchfork bifurcations, the latter of which enables hysteresis and coexistence of uniform and polarized states.

References in corpus (9)

• Self-motile colloidal particles: from directed propulsion to random walk
• Propulsion of a molecular machine by asymmetric distribution of reaction--products
• Self-propulsion of pure water droplets by spontaneous Marangoni stress driven motion
• Active phase separation in mixtures of chemically interacting particles
• Autophoretic locomotion from geometric asymmetry
• Geometric tuning of self-propulsion for Janus catalytic particles
• Phoretic and hydrodynamic interactions of weakly-confined autophoretic particles
• Protein recruitment through indirect mechanochemical interactions
• Spontaneous onset of convection in a uniform phoretic channel

Cited by in corpus (4)

• Self-propulsion of chemically-active droplets
• Spontaneous chiralization of polar active colloids
• Conditions for the propulsion of a colloid surrounded by a mesoscale phase separation
• Onsager reciprocal relations and chemo-mechanical coupling for chemically-active colloids