Journal
NANO LETTERS
Volume 15, Issue 7, Pages 4412-4416Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01925
Keywords
Nanopropellers; magnetic nanomotors; microswimmers; viscous hydrodynamics; rotating magnetic field; glancing angle deposition (GLAD)
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Funding
- German-Israeli Foundation (GIF) [I-1255-303.10/2014]
- Rubin Scientific and Medical Research Fund
- Israel Ministry for Immigrant Absorption
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Locomotion in fluids at the nanoscale is dominated by viscous drag. One efficient propulsion scheme is to use a weak rotating magnetic field that drives a chiral object. Froth bacterial flagella to artificial drills, the corkscrew is a universally useful chiral shape for propulsion in viscous environments. Externally powered magnetic micro- and nanomotors have been recently developed that allow for precise fuel-free propulsion in complex media. Here, we combine analytical and numerical theory with experiments on nanostructured screw-propellers to show that the optimal length is surprisingly short only about one helical turn, which is shorter than most of the structures in use to date. The results have important implications for the design of artificial actuated nano- and micropropellers and can dramatically reduce fabrication times, while ensuring optimal performance.
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