Multiple phoretic mechanisms in the self-propulsion of a Pt-insulator Janus swimmer

Abstract

We present a detailed theoretical study which demonstrates that electrokinetic effects can also play a role in the motion of metallic-insulator spherical Janus particles. Essential to our analysis is the identification of the fact that the reaction rates depend on Pt- coating thickness and that the thickness of coating varies from pole to equator of the coated hemisphere. We find that their motion is due to a combination of neutral and ionic diffusiophoretic as well as electrophoretic effects whose interplay can be changed by varying the ionic properties of the fluid. This has great potential significance for optimising performance of designed synthetic swimmers.

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Cited by in corpus (25)

• Experimental Observation of Flow Fields Around Active Janus Spheres
• Phoretic and hydrodynamic interactions of weakly-confined autophoretic particles
• How walls affect the dynamics of self-phoretic microswimmers
• Diffusion-based height analysis reveals robust microswimmer-wall separation
• Thermodynamics of active matter: Tracking dissipation across scales
• Self-Propelled Colloidal Particle Near a Planar Wall: A Brownian Dynamics Study
• Exact axisymmetric interaction of phoretically active Janus particles
• Self-diffusiophoresis of Janus particles that release ions
• Hydrochemical interactions of phoretic particles: a regularized multipole framework
• Large scale Micro-Photometry for high resolution pH-characterization during electro-osmotic pumping and modular micro-swimming
• Auto-electrophoresis in non-Newtonian media: interaction of rheology and electrocatalytic parameters
• Unraveling Modular Microswimmers: From Self-Assembly to Ion-Exchange Driven Motors
• Thermodynamic Approach to the Self-Diffusiophoresis of Colloidal Janus Particles
• Theoretical modeling of catalytic self-propulsion
• Enhanced diffusivity in microscopically reversible active matter
• Diffusiophoretic propulsion of an isotropic active colloidal particle near a finite-sized disk embedded in a planar fluid-fluid interface
• Self-motility of an active particle induced by correlations in the surrounding solution
• Diffusiophoresis of ionic catalytic particles
• Limiting propulsion of ionic microswimmers
• Turning catalytically active pores into active pumps
• Ionic self-phoresis maps onto correlation-induced self-phoresis
• Floor- or ceiling-sliding for chemically active, gyrotactic, sedimenting Janus particles
• Clustering-induced self-propulsion of isotropic autophoretic particles
• The non-equilibrium thermodynamics of active suspensions
• The stress tensor of dilute active colloidal suspensions