期刊
SOFT MATTER
卷 10, 期 11, 页码 1784-1789出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3sm52815d
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资金
- NSF [NYU MRSEC DMR-0820341, MRI-0821520, DMR-0923251, DMS-0920930]
- DOE [DE-FG02-88ER25053]
- AFOSR [FA-9550-13-1-0188]
Self-propelled particles can exhibit surprising non-equilibrium behaviors, and how they interact with obstacles or boundaries remains an important open problem. Here we show that chemically propelled micro-rods can be captured, with little change in their speed, into close orbits around solid spheres resting on or near a horizontal plane. We show that this interaction between sphere and particle is short-range, occurring even for spheres smaller than the particle length, and for a variety of sphere materials. We consider a simple model, based on lubrication theory, of a force-and torque-free swimmer driven by a surface slip (the phoretic propulsion mechanism) and moving near a solid surface. The model demonstrates capture, or movement towards the surface, and yields speeds independent of distance. This study reveals the crucial aspects of activity-driven interactions of self-propelled particles with passive objects, and brings into question the use of colloidal tracers as probes of active matter.
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