Glass microshperes propelled by micrometric Ni particles in an aqueous medium driven by ellipsoidal AC magnetic fields

M.A. LLERA, C. CHILIOTTE, V. BEKERIS, G. JORGE

Buenos Aires

Congreso; Stat Phys 2019; 2019

Glass microshperes propelled by micrometric Ni particles in an aqueous mediumdriven by ellipsoidal AC magnetic fieldsM.A. Llera, C. Chiliotte, V. Bekeris, G. JorgeRecently, the phenomenology of magnetic particles in aqueous media subject to external excitations has drawn strong attention. The way in which these systems move and self-organize, particularly under time-dependent excitations, has been studied in several works, and the results are of great interest both from the point of view of basic physics and of technological applications, ranging from biomedicine, directed drug transportation to microfluid stirring. In this work, we use three Helmholtz coils to generate variable magnetic fields in time and space. In particular, circularly polarized fields are applied to move micrometer nickel particles located at the bottom of a container filled with an aqueous medium. We study the time dependent displacement of these particles through the analysis of video-microscopy images. The chain structure formations are observed, as well as individual particles or groups of particles whose displacements can be handled at will, in any spatial direction on the bottom plane of the vessel. Here we show that when glass microspheres are added close to the nickel particles, the microspheres motion is induced by the displacement and rotation of the magnetic particles and their hydrodynamic interactions, and this motion may be targeted after certain magnetic particle configurations are self-organized.