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Centrifugo-magnetic pump for gas-to-liquid sampling.pdf

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Centrifugo-magnetic pump for gas-to-liquid sampling

At i a l p ? K 1 o o i i e p c w b t o c c w o 0 dSensors and Actuators A 135 (2007) 28–33 Centrifugo-magnetic pump for gas-to-liquid sampling Stefan Haeberle a,?, Norbert Schmitt a, Roland Zengerle a,b, Jens Ducre?e a,b a Laboratory for MEMS Applications, Department of Microsystems Engineering (IMTEK), University of Freiburg, Georges-Koehler-Allee 106, 79110 Freiburg, Germany b HSG-IMIT, Institute for Micromachining and Information Technology, Wilhelm-Schickard-Stra?e 10, 78052 Villingen-Schwenningen, Germany Received 28 February 2006; received in revised form 30 August 2006; accepted 6 September 2006 Available online 13 October 2006 bstract This paper describes a novel gas micropump realized on a centrifugal microfluidic platform. The pump is integrated on a passive and microstruc- ured polymer disk which is sealed by an elastomer lid featuring paramagnetic inlays. The rotational motion of this hybrid over a stationary magnet nduces a designated sequence of volume displacements of the elastic lid, leading to a net transport of gas. The pumping pressure was determined s a function of the frequency of rotation, with a maximum observable pressure of 4.1 kPa without further optimization.The first application of this rotary device is the production of gas–liquid flows by pumping ambient air into a continuous centrifugal flow of iquid. The injected gas volume segments the liquid stream into a series of liquid compartments. Apart from such multi-phase flows, the new umping technique supplements a generic air-to-liquid sampling method to centrifugal microfluidic platforms. 2006 Elsevier B.V. All rights reserved. sam p a c i o r n t s c n p p r neywords: Centrifugal microfluidics; Micropump; Segmented flow; Gas–liquid . Introduction The toolbox of centrifugal microfluidics has been continu- usly extended over the last decade. Up to now, a diverse set f unit operations such as cell-lysis [1], continuous micromix- ng [2–4], hematocrit determination [5] as well as application