期刊
SOFT MATTER
卷 12, 期 30, 页码 6357-6364出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6sm01163b
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资金
- National Science Foundation [DMR-1305875]
- MRSEC Program of the National Science Foundation [DMR-1420073]
- Gordon and Betty Moore Foundation [GBMF3849]
We describe colloidal Janus particles with metallic and dielectric faces that swim vigorously when illuminated by defocused optical tweezers without consuming any chemical fuel. Rather than wandering randomly, these optically-activated colloidal swimmers circulate back and forth through the beam of light, tracing out sinuous rosette patterns. We propose a model for this mode of light-activated transport that accounts for the observed behavior through a combination of self-thermophoresis and optically-induced torque. In the deterministic limit, this model yields trajectories that resemble rosette curves known as hypotrochoids.
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