Berlin 2018 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 70: Poster: Flows, Patterns, Delay, Reaction Diffusion
DY 70.13: Poster
Thursday, March 15, 2018, 15:30–18:00, Poster A
Propulsion and hydrodynamic particle transport of a magnetically driven colloidal ribbon — •Helena Massana-Cid1, Fernando Martinez-Pedrero2, Eloy Navarro-Argemí1,3, Ignacio Pagonabarraga1,3, and Pietro Tierno1,3,4 — 1Departament de Física de la Matèria Condensada, Universitat de Barcelona, E-08028, Barcelona, Spain — 2Departamento de Química Física I, Universidad Complutense de Madrid, Ciudad Universitaria, E-28040, Madrid, Spain — 3Universitat de Barcelona Institute of Complex Systems (UBICS), Universitat de Barcelona, E-08028, Barcelona, Spain — 4Institut de Nanociència i Nanotecnologia, IN2UB, Universitat de Barcelona, E-08028, Barcelona, Spain
We describe a method to trap, transport and release microscopic particles in a viscous fluid using the hydrodynamic flow field generated by a magnetically driven colloidal ribbon. The ribbon is composed by ferromagnetic microellipsoids that assemble perpendicular to each other due to their permanent magnetic moment. We use an external precessing magnetic field to torque the anisotropic particles forming this structure, and the particle rotational motion is rectified into a net translation due to the hydrodynamic coupling with the surface. Non-magnetic particles can be captured or expelled by the hydrodynamic flow field generated by the propelling ribbon. The proposed technique may be used in channel-free microfluidic applications, where precise trapping and transport of functionalized particles via non invasive magnetic fields is required.