Journal
SOFT MATTER
Volume 12, Issue 1, Pages 131-140Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sm01831e
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Funding
- UK EPSRC [EP/J007404/1]
- EU [623364, 623637]
- ERC Advanced Grant [340877-PHYSAPS]
- Engineering and Physical Sciences Research Council [EP/J007404/1] Funding Source: researchfish
- EPSRC [EP/J007404/1] Funding Source: UKRI
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We study catalytic Janus particles and Escherichia coli bacteria swimming in a two-dimensional colloidal crystal. The Janus particles orbit individual colloids and hop between colloids stochastically, with a hopping rate that varies inversely with fuel (hydrogen peroxide) concentration. At high fuel concentration, these orbits are stable for 100s of revolutions, and the orbital speed oscillates periodically as a result of hydrodynamic, and possibly also phoretic, interactions between the swimmer and the six neighbouring colloids. Motile E. coli bacteria behave very differently in the same colloidal crystal: their circular orbits on plain glass are rectified into long, straight runs, because the bacteria are unable to turn corners inside the crystal.
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