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Title: Colloidal Microworms Propelling via a Cooperative Hydrodynamic Conveyor Belt
Author: Martinez-Pedrero, Fernando
Ortiz-Ambriz, Antonio
Pagonabarraga Mora, Ignacio
Tierno, Pietro
Keywords: Col·loides
Issue Date: 22-Sep-2015
Publisher: American Physical Society
Abstract: 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.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2015, vol. 115, p. 138301-1-138301-5
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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