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Micromachines 2013, 4(1), 9-21; doi:10.3390/mi4010009
Article

A Low-Cost, Normally Closed, Solenoid Valve for Non-Contact Dispensing in the Sub-µL Range

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1 Department of Microsystems Engineering, University of Freiburg, IMTEK, Georges-Köhler Allee 103, 79110 Freiburg, Germany 2 Institut für Mikro- und Informationstechnik, HSG-IMIT, Wilhelm-Schickard-Straβe 10, 78052 Villingen-Schwenningen, Germany 3 Biofluidix GmbH, Georges-Köhler Allee 103, 79110 Freiburg, Germany
* Author to whom correspondence should be addressed.
Received: 11 December 2012 / Revised: 4 February 2013 / Accepted: 4 February 2013 / Published: 28 February 2013
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Abstract

We present a disposable, normally closed, non-contact dispensing valve for the sub-µL range. The miniaturized solenoid valve (diameter: 8 mm, height: 27.25 mm) is compatible to standard Luer-Lock interfaces. A highly dynamic actuation principle enables opening times down to 1 ms. The dispensing performance was evaluated for water (η = 1.03 mPas) and a 66% (w/w) glycerol/water solution (η = 16.98 mPas), at pressures varying from 200 to 800 mbar. The experimentally determined minimal dispensing volume was 163 nL (CV 1.6%) for water and 123 nL (CV 4.5%) for 66% (w/w) glycerol/water. The low-cost polymer valve enables high precision dispensing of liquid volumes down to the lower end of the sub-µL range comparable to high-end non-disposable micro-dispensing valves.
Keywords: non-contact dispensing; solenoid valve; normally closed; disposable non-contact dispensing; solenoid valve; normally closed; disposable
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Bammesberger, S.B.; Kartmann, S.; Tanguy, L.; Liang, D.; Mutschler, K.; Ernst, A.; Zengerle, R.; Koltay, P. A Low-Cost, Normally Closed, Solenoid Valve for Non-Contact Dispensing in the Sub-µL Range. Micromachines 2013, 4, 9-21.

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