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Magnetically Induced Flow Focusing of Non-Magnetic Microparticles in Ferrofluids under Inclined Magnetic Fields

School of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China
Author to whom correspondence should be addressed.
Micromachines 2019, 10(1), 56;
Received: 30 December 2018 / Revised: 11 January 2019 / Accepted: 14 January 2019 / Published: 15 January 2019
(This article belongs to the Special Issue Micro- and Nanofluidics for Bionanoparticle Analysis)
PDF [5950 KB, uploaded 22 January 2019]
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The ability to focus biological particles into a designated position of a microchannel is vital for various biological applications. This paper reports particle focusing under vertical and inclined magnetic fields. We analyzed the effect of the angle of rotation (θ) of the permanent magnets and the critical Reynolds number (Rec) on the particle focusing in depth. We found that a rotation angle of 10° is preferred; a particle loop has formed when Re < Rec and Rec of the inclined magnetic field is larger than that of the vertical magnetic field. We also conducted experiments with polystyrene particles (10.4 μm in diameter) to prove the calculations. Experimental results show that the focusing effectiveness improved with increasing applied magnetic field strength or decreasing inlet flow rate. View Full-Text
Keywords: flow focusing; magnetic field; microparticles; ferrofluids flow focusing; magnetic field; microparticles; ferrofluids

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Luo, L.; He, Y. Magnetically Induced Flow Focusing of Non-Magnetic Microparticles in Ferrofluids under Inclined Magnetic Fields. Micromachines 2019, 10, 56.

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