Dynamics of Janus motors with microscopically reversible kinetics

Abstract

Janus motors with chemically active and inactive hemispheres can operate only under nonequilibrium conditions where detailed balance is broken by fluxes of chemical species that establish a nonequilibrium state. A microscopic model for reversible reactive collisions on a Janus motor surface is constructed and shown to satisfy detailed balance. The model is used to study Janus particle reactive dynamics in systems at equilibrium where generalized chemical rate laws that include time-dependent rate coefficients with power-law behavior are shown to describe reaction rates. While maintaining reversible reactions on the Janus catalytic hemisphere, the system is then driven into a nonequilibrium steady state by fluxes of chemical species that control the chemical affinity. The statistical properties of the self-propelled Janus motor in this nonequilibrium steady state are investigated and compared with predictions of a fluctuating thermodynamics theory. The model has utility beyond the examples presented here, since it allows one to explore various aspects of nonequilibrium fluctuations in systems with self-diffusiophoretic motors from a microscopic perspective.

References in corpus (10)

• Active Particles in Complex and Crowded Environments
• Active Brownian Particles. From Individual to Collective Stochastic Dynamics
• Propulsion of a molecular machine by asymmetric distribution of reaction--products
• Dynamic clustering in active colloidal suspensions with chemical signaling
• Giant amplification of interfacially driven transport by hydrodynamic slip: diffusio-osmosis and beyond
• A Classical Density-Functional Theory for Describing Water Interfaces
• Active colloids in the context of chemical kinetics
• Phoretic self-propulsion: a mesoscopic description of reaction dynamics that powers motion
• Fluctuating chemohydrodynamics and the stochastic motion of self-diffusiophoretic particles
• Mechanochemical fluctuation theorem and thermodynamics of self-phoretic motors

Cited by in corpus (11)

• Thermodynamics and statistical mechanics of chemically-powered synthetic nanomotors
• Single particle motion and collective dynamics in Janus motor systems
• Enhanced diffusivity in microscopically reversible active matter
• Simulation of microswimmer hydrodynamics with multiparticle collision dynamics
• The stochastic motion of self-thermophoretic Janus particles
• Control of active polymeric filaments by chemically-powered nanomotors
• Finite-time fluctuation theorem for diffusion-influenced surface reactions on spherical and Janus catalytic particles
• Microscopic theory of a Janus motor in a non-equilibrium fluid: Surface hydrodynamics and boundary conditions
• Diffusion coefficient and power spectrum of active particles with a microscopically reversible mechanism of self-propelling
• Self-organization of active colloids mediated by chemical interactions
• Onsager reciprocal relations and chemo-mechanical coupling for chemically-active colloids