Thermodynamic Approach to the Self-Diffusiophoresis of Colloidal Janus Particles

Abstract

Most available theoretical predictions for the self-diffusiophoretic motion of colloidal particles are based on the hydrodynamic thin boundary layer approximation in combination with a solvent body force due to a self-generated local solute gradient. This gradient is enforced through specifying boundary conditions, typically without accounting for the thermodynamic cost to maintain the gradient. Here we present an alternative thermodynamic approach that exploits a direct link between dynamics and entropy production: the local detailed balance condition. We study two cases: First, we revisit self-propulsion in a demixing binary solvent. At variance with a slip velocity, we find that propulsion is due to forces at the poles that are perpendicular to the particle surface. Second, for catalytic swimmers driven through liberating chemical free energy we recover previous expressions. In both cases we argue that propulsion is due to asymmetric dissipation and not simply due to an asymmetric concentration of molecular solutes.

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• Irreversibility, heat and information flows induced by non-reciprocal interactions
• Thermodynamics of active matter: Tracking dissipation across scales
• Active matter, microreversibility, and thermodynamics
• Asymmetry-induced order in multilayer networks
• Enhanced diffusivity in microscopically reversible active matter
• Diffusion coefficient and power spectrum of active particles with a microscopically reversible mechanism of self-propelling
• Nanoswimmers in a ratchet potential: Effects of a transverse rocking force
• The non-equilibrium thermodynamics of active suspensions