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Micromachines 2017, 8(12), 365; https://doi.org/10.3390/mi8120365

A Liquid-Metal Based Spiral Magnetohydrodynamic Micropump

1,2
,
1
and
1,2,*
1
Beijing Key Lab of Cryo-Biomedical Engineering and Key Lab of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Road, Haidian District, Beijing 100190, China
2
University of Chinese Academy of Sciences, 19 Yuquan Road, Shijingshan District, Beijing 100039, China
*
Author to whom correspondence should be addressed.
Received: 9 November 2017 / Revised: 10 December 2017 / Accepted: 14 December 2017 / Published: 18 December 2017
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Abstract

A liquid-metal based spiral magnetohydrodynamic (MHD) micropump is proposed in this work. The micropump was fabricated in a polydimethylsiloxane (PDMS)-glass hybrid microfluidic chip. This pump utilized two parallel liquid-metal-filled channels as electrodes to generate a parallel electrical field across the pumping channel between the two electrodes. To prevent contact and cross contamination between the liquid metal in the electrode channel and the sample fluid in the pumping channel, a PDMS gap was designed between the liquid metal and the sample fluid. To minimize the chip size, the parallel electrode and pumping channels were designed in a spiral shape. To test pumping performance, NaCl aqueous solution containing fluorescent particles (0.5 μm in diameter) was filled into the pumping channel as the working sample fluid. When a pair of identical magnets (0.4 T) was placed onto both top and bottom surfaces of the chip, the pump was able to drive the sample fluid at a flow velocity of 233.26 μm/s at 3000 V. The pump has no moving parts, and the electrodes are easily fabricated, making the pump suitable for miniaturization and integration into microfluidic systems. View Full-Text
Keywords: microfluidics; magnetohydrodynamic; micropump; liquid metal microfluidics; magnetohydrodynamic; micropump; liquid metal
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhou, X.; Gao, M.; Gui, L. A Liquid-Metal Based Spiral Magnetohydrodynamic Micropump. Micromachines 2017, 8, 365.

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