用于液滴铁磁微流体的电永磁驱动
Electropermanent magnet actuation for droplet ferromicrofluidics.
作者信息
Padovani José I, Jeffrey Stefanie S, Howe Roger T
机构信息
Department of Electrical Engineering, School of Engineering, Stanford University, Stanford, CA 94305, USA.
Department of Surgery, School of Medicine, Stanford University, Stanford, CA 94305, USA.
出版信息
Technology (Singap World Sci). 2016 Jun;4(2):110-119. doi: 10.1142/S2339547816500023. Epub 2016 May 13.
Droplet actuation is an essential mechanism for droplet-based microfluidic systems. On-demand electromagnetic actuation is used in a ferrofluid-based microfluidic system for water droplet displacement. Electropermanent magnets (EPMs) are used to induce 50 mT magnetic fields in a ferrofluid filled microchannel with gradients up to 6.4 × 10 kA/m. Short 50 µs current pulses activate the electropermanent magnets and generate negative magnetophoretic forces that range from 10 to 70 nN on 40 to 80 µm water-in-ferrofluid droplets. Maximum droplet displacement velocities of up to 300 µm/s are obtained under flow and no-flow conditions. Electropermanent magnet-activated droplet sorting under continuous flow is demonstrated using a split-junction microfluidic design.
液滴驱动是基于液滴的微流控系统的一种基本机制。基于铁磁流体的微流控系统中采用按需电磁驱动来实现水滴的位移。电永磁体（EPM）用于在充满铁磁流体的微通道中感应出50 mT的磁场，磁场梯度高达6.4×10 kA/m。50 µs的短电流脉冲激活电永磁体，并产生负磁泳力，该力作用于40至80 µm的铁磁流体包水液滴上，范围为10至70 nN。在有流和无流条件下，可获得高达300 µm/s的最大液滴位移速度。使用分流微流控设计展示了在连续流动下电永磁体激活的液滴分选。
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