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Title: Propulsion and hydrodynamic particle transport of magnetically twisted colloidal ribbons
Author: Massana Cid, Helena
Navarro Agermi, Eloy
Martínez Pedrero, Fernando
Pagonabarraga Mora, Ignacio
Tierno, Pietro
Keywords: Partícules (Matèria)
Camps magnètics (Física còsmica)
Cosmic magnetic fields
Issue Date: 25-Oct-2017
Publisher: Institute of Physics Pub.
Abstract: We describe a method to trap, transport and release microscopic particles in a viscous fluid using the hydrodynamic flow field generated by a magnetically propelled colloidal ribbon. The ribbon is composed of ferromagnetic microellipsoids that arrange with their long axis parallel to each other, a configuration that is energetically favorable due to their permanent magnetic moments. We use an external precessing magnetic field to torque the anisotropic particles forming the ribbon, and to induce propulsion of the entire structure due to the hydrodynamic coupling with the close substrate. The propulsion speed of the ribbon can be controlled by varying the driving frequency, or the amplitude of the precessing field. The latter parameter is also used to reduce the average inter particle distance and to induce the twisting of the ribbon due to the increase in the attraction between the rotating ellipsoids. Furthermore, non magnetic particles are attracted or repelled with the hydrodynamic flow field generated by the propelling ribbon. The proposed method may be used in channel free microfluidic applications, where the precise trapping and transport of functionalized particles via non invasive magnetic fields is required.
Note: Reproducció del document publicat a:
It is part of: New Journal of Physics, 2017, vol. 19 , num. 103031
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ISSN: 1367-2630
Appears in Collections:Articles publicats en revistes (Institut de Nanociència i Nanotecnologia (IN2UB))
Articles publicats en revistes (Institut de Recerca en Sistemes Complexos (UBICS))
Articles publicats en revistes (Física de la Matèria Condensada)

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