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Magnetic particle mixing with magnetic micro-convection for microfluidics

Abstract : In this paper we discuss the magnetic micro-convection phenomenon as a tool for mixing enhancement in microfluidics systems in cases when one of the mis-cible fluids is a magnetic particle colloid. A system of a water-based magnetic fluid and water is investigated experimentally under homogeneous magnetic field in a Hele-Shaw cell. Subsequent image analysis both qualitatively and quan-titatively reveals the high enhancement of mixing efficiency provided by this method. The mixing efficiency dependence on the magnetic field and the phys-ical limits is discussed. A suitable model for a continuous-flow microfluidics setup for mixing with magnetic micro-convection is also proposed and justified with an experiment. In addition, possible applications in improving the speed of ferrohydrodynamic sorting and magnetic label or selected tracer mixing in lab on a chip systems are noted.
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Submitted on : Monday, February 16, 2015 - 5:26:25 PM
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Guntars Kitenbergs, Kaspars Erglis, Régine Perzynski, Andrejs Cēbers. Magnetic particle mixing with magnetic micro-convection for microfluidics. Journal of Magnetism and Magnetic Materials, Elsevier, 2015, 380, pp.227 - 230. ⟨10.1016/j.jmmm.2014.10.033⟩. ⟨hal-01117158⟩

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