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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

1,* , 1
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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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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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