Giant negative mobility of Janus particles in a corrugated channel

Giant negative mobility of Janus particles in a corrugated channel

We numerically simulate the transport of elliptic Janus particles along narrow two-dimensional channels with reflecting walls. The self-propulsion velocity of the particle is oriented along either its major (prolate) or minor axis (oblate). In smooth channels, we observe long diffusion transients: b...

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Veröffentlicht in:Physical review. E, Statistical, nonlinear, and soft matter physics Statistical, nonlinear, and soft matter physics, 2014-06, Vol.89 (6), p.062115-062115, Article 062115
Hauptverfasser: Ghosh, Pulak K, Hänggi, Peter, Marchesoni, Fabio, Nori, Franco
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Computer Simulation
Diffusion
Models, Chemical
Motion
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container_issue 6
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container_title Physical review. E, Statistical, nonlinear, and soft matter physics
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creator Ghosh, Pulak K
Hänggi, Peter
Marchesoni, Fabio
Nori, Franco
description We numerically simulate the transport of elliptic Janus particles along narrow two-dimensional channels with reflecting walls. The self-propulsion velocity of the particle is oriented along either its major (prolate) or minor axis (oblate). In smooth channels, we observe long diffusion transients: ballistic for prolate particles and zero diffusion for oblate particles. Placed in a rough channel, prolate particles tend to drift against an applied drive by tumbling over the wall protrusions; for appropriate aspect ratios, the modulus of their negative mobility grows exceedingly large (giant negative mobility). This suggests that a small external drive suffices to efficiently direct self-propulsion of rod-like Janus particles in rough channels.
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subjects Computer Simulation
Diffusion
Models, Chemical
Motion
title Giant negative mobility of Janus particles in a corrugated channel
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