Abstract
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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1784-1789 |
| Number of pages | 6 |
| Journal | Soft Matter |
| Volume | 10 |
| Issue number | 11 |
| DOIs | |
| State | Published - Mar 21 2014 |
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ASJC Scopus subject areas
- Chemistry(all)
- Condensed Matter Physics
Cite this
Hydrodynamic capture of microswimmers into sphere-bound orbits. / Takagi, Daisuke; Palacci, Jérémie; Braunschweig, Adam; Shelley, Michael J.; Zhang, Jun.
In: Soft Matter, Vol. 10, No. 11, 21.03.2014, p. 1784-1789.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hydrodynamic capture of microswimmers into sphere-bound orbits
AU - Takagi, Daisuke
AU - Palacci, Jérémie
AU - Braunschweig, Adam
AU - Shelley, Michael J.
AU - Zhang, Jun
PY - 2014/3/21
Y1 - 2014/3/21
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84894472199&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84894472199&partnerID=8YFLogxK
U2 - 10.1039/c3sm52815d
DO - 10.1039/c3sm52815d
M3 - Article
C2 - 24800268
AN - SCOPUS:84894472199
VL - 10
SP - 1784
EP - 1789
JO - Soft Matter
JF - Soft Matter
SN - 1744-683X
IS - 11
ER -