Interaction of Active Janus Particles with Passive Tracers

Abstract

In this study, we investigated the motion of active SiO2-Pt Janus particles in the 2D bath of smaller silica tracers dispersed in varying areal densities. The effect on the organization of the tracer particles around the active JPs was also explored. Our experiments indicate that the interaction between the tracers and the active JPs mainly depend on the nature of collision marked by the duration of contact. For all the concentration regimes, we have shown that the short time collisions do not have significant impact on the motion of active JPs, however, during moderate/long-time collisions tracer(s) can lead to a significant change in active JPs motion and even cause them to rotate. In the concentrated regime, our experiments reveal the emergence of a novel organizational behavior of the passive tracers on the trailing Pt and the leading SiO2 with a strong dependence on the nature of collision.

20 pages, 9 figures

References in corpus (6)

• Self-motile colloidal particles: from directed propulsion to random walk
• Propulsion of a molecular machine by asymmetric distribution of reaction--products
• Cross-stream migration of active particles
• Active Brownian particles and run-and-tumble particles separate inside a maze
• Translational and rotational dynamics of a self-propelled Janus probe in crowded environments
• Rheotaxis of Active Droplets

Cited by in corpus (4)

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• Chemically symmetric and asymmetric self-driven rigid dumbbells in 2D polymer gel
• Deforming Active Droplets in Viscoelastic Media
• Sorting of binary active-passive mixtures in designed microchannels