Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.138301
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Funding
- ERC
- Ramon y Cajal Program [RYC-2011-07605]
- MINECO [FIS2013-41144-P]
- DURSI [2014SGR878, 2014SGR-922]
- MINECO (Spain) [FIS2011-22603]
- Generalitat de Catalunya under Program ICREA Academia
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We study propulsion arising from microscopic colloidal rotors dynamically assembled and driven in a viscous fluid upon application of an elliptically polarized rotating magnetic field. Close to a confining plate, the motion of this self-assembled microscopic worm results from the cooperative flow generated by the spinning particles which act as a hydrodynamic conveyor belt. Chains of rotors propel faster than individual ones, until reaching a saturation speed at distances where induced-flow additivity vanishes. By combining experiments and theoretical arguments, we elucidate the mechanism of motion and fully characterize the propulsion speed in terms of the field parameters.
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