Controlled swimming in confined fluids of magnetically actuated colloidal rotors

Tierno, P.; Golestanian, Ramin; Pagonabarraga, I.; Sagués, F.

doi:10.1103/PhysRevLett.101.218304

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Controlled swimming in confined fluids of magnetically actuated colloidal rotors

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Golestanian, Ramin
Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Tierno, P., Golestanian, R., Pagonabarraga, I., & Sagués, F. (2008). Controlled swimming in confined fluids of magnetically actuated colloidal rotors. Physical Review Letters, 101(21): 218304. doi:10.1103/PhysRevLett.101.218304.

Cite as: https://hdl.handle.net/21.11116/0000-0001-7911-4

Abstract

We show that DNA-linked anisotropic doublets composed of paramagnetic colloidal particles can be endowed with controlled propulsion when floating above a flat plate and subjected to a magnetic field precessing around an axis parallel to the plate. The propulsion mechanism for this artificial swimmer does not involve deformations, and it makes use of the minimal two degrees of freedom needed to propel it at low Reynolds numbers. We combine experimental observations with a theoretical analysis that fully characterizes the propulsion velocity in terms of the strength and frequency of the actuating magnetic field. © 2008 The American Physical Society.