Focusing microparticles in a microfluidic channel with ferrofluids |
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Authors: | Taotao Zhu Rui Cheng Leidong Mao |
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Affiliation: | 1. Department of Chemistry, Nanoscale Science and Engineering Center, The University of Georgia, Athens, GA, 30602, USA 2. Faculty of Engineering, Nanoscale Science and Engineering Center, The University of Georgia, Athens, GA, 30602, USA
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Abstract: | We report a novel on-chip microparticles focusing technique using stable magnetic nanoparticles suspension (i.e., ferrofluids). The principle of focusing is based on magnetic buoyancy forces exerted on non-magnetic particles within ferrofluids under non-uniform magnetic field. The design, modeling, fabrication, and characterization of the focusing scheme are presented. Focusing of 4.8, 5.8, and 7.3 ??m microparticles at various flow rates are demonstrated in a microfluidic channel. Our scheme is simple, low-cost, and label-free compared to other existing techniques. |
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