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Open AccessArticle

A Magnetically Tunable Check Valve Applied to a Lab-on-Chip Nitrite Sensor

Department of Electrical and Computer Engineering, Dalhousie University, 1360 Barrington Street, Halifax, NS B3H 4R2, Canada
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Author to whom correspondence should be addressed.
Sensors 2019, 19(21), 4619; https://doi.org/10.3390/s19214619
Received: 4 October 2019 / Revised: 17 October 2019 / Accepted: 21 October 2019 / Published: 24 October 2019
(This article belongs to the Section Chemical Sensors)
Presented here is the fabrication and characterization of a tunable microfluidic check valve for use in marine nutrient sensing. The ball-style valve makes use of a rare-earth permanent magnet, which exerts a pulling force to ensure it remains passively sealed until the prescribed cracking pressure is met. By adjusting the position of the magnet, the cracking pressure is shown to be customizable to meet design requirements. Further applicability is shown by integrating the valve into a poly(methyl methacrylate) (PMMA) lab-on-chip device with an integrated optical absorbance cell for nitrite detection in seawater. Micro-milling is used to manufacture both the valve and the micro-channel structures. The valve is characterized up to a flow rate of 14 mL min−1 and exhibits low leakage rates at high back pressures (<2 µL min−1 at ~350 kPa). It is low cost, requires no power, and is easily implemented on microfluidic platforms. View Full-Text
Keywords: microfluidics; nanomolar nitrite; in situ marine sensor; lab-on-chip; valve microfluidics; nanomolar nitrite; in situ marine sensor; lab-on-chip; valve
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MDPI and ACS Style

Morgan, S.C.; Hendricks, A.D.; Seto, M.L.; Sieben, V.J. A Magnetically Tunable Check Valve Applied to a Lab-on-Chip Nitrite Sensor. Sensors 2019, 19, 4619. https://doi.org/10.3390/s19214619

AMA Style

Morgan SC, Hendricks AD, Seto ML, Sieben VJ. A Magnetically Tunable Check Valve Applied to a Lab-on-Chip Nitrite Sensor. Sensors. 2019; 19(21):4619. https://doi.org/10.3390/s19214619

Chicago/Turabian Style

Morgan, Sean C.; Hendricks, Andre D.; Seto, Mae L.; Sieben, Vincent J. 2019. "A Magnetically Tunable Check Valve Applied to a Lab-on-Chip Nitrite Sensor" Sensors 19, no. 21: 4619. https://doi.org/10.3390/s19214619

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