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The fabrication of synthetic self-propelled particles and the experimentalinvestigations of their dynamics have stimulated interest in self-generatedphoretic effects that propel nano- and micron-scale objects. Theoreticalmodeling of these phenomena is often based on a continuum description of thesolvent for different phoretic propulsion mechanisms, including,self-electrophoresis, self-diffusiophoresis and self-thermophoresis. The workin this paper considers various types of catalytic chemical reaction at themotor surface and in the bulk fluid that come into play in mesoscopicdescriptions of the dynamics. The formulation is illustrated by developing themesoscopic reaction dynamics for exothermic and dissociation reactions that areused to power motor motion. The results of simulations of the self-propelleddynamics of composite Janus particles by these mechanisms are presented.

Phoretic self-propulsion: a mesoscopic description of reaction dynamics that powers motion