Activated barrier crossing dynamics of a Janus particle carrying cargo

Tanwi Debnath; Pulak Kumar Ghosh

doi:10.1039/c8cp04419h

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arXiv · 1812.07891

Activated barrier crossing dynamics of a Janus particle carrying cargo

Tanwi Debnath·Pulak Kumar Ghosh

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Abstract

We numerically study the escape kinetics of a self-propelled Janus particle, carrying a cargo, from a meta-stable state. We assume that the cargo is attached to the Janus particle by a flexible harmonic spring. We take into account the effect of velocity field, created in the fluid due to movements of dimer's components, by considering space-dependent diffusion tensor (Oseen tensor). Our simulation results show that the synchronization between barrier crossing events and rotational relaxation process can enhance escape rate to a large extent. Also, the load carrying capability of a Janus particle is largely controlled by its rotational dynamics and self-propulsion velocity. Moreover, the hydrodynamic interaction, conspicuously, enhances the escape rate of the Janus-cargo dimer. The most of the important features in escape kinetics have been justified based on the analytic arguments.

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Tanwi Debnath, Pulak Kumar Ghosh. 2018-12-19. Activated barrier crossing dynamics of a Janus particle carrying cargo. https://doi.org/10.1039/c8cp04419h

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