Journal
PHYSICAL REVIEW E
Volume 89, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.89.062115
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Funding
- Cluster of Excellence Nanosystems Initiative Munich (NIM)
- Program for Internationalization of the Augsburg University
- RIKEN iTHES Project
- MURI Center for Dynamic Magneto-Optics
- Grants-in-Aid for Scientific Research [22224007] Funding Source: KAKEN
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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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