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Colloidal Microworms Propelling via a Cooperative Hydrodynamic Conveyor Belt

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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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MARTÍNEZ PEDRERO, Fernando, ORTIZ-AMBRIZ, Antonio, PAGONABARRAGA MORA, Ignacio, TIERNO, Pietro. Colloidal Microworms Propelling via a Cooperative Hydrodynamic Conveyor Belt. _Physical Review Letters_. 2015. Vol. 115, núm. 138301-1-138301-5. [consulta: 14 de gener de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/67045]

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