Aliquoting structure for centrifugal microfluidics based on a new pneumatic valve
Mark, D., Haeberle, S., Metz, T., Lutz, S., Ducrée, JensORCID: 0000-0002-0366-1897, Zengerle, Roland and von Stetten, F.
(2008)
Aliquoting structure for centrifugal microfluidics based on a new pneumatic valve.
In: MEMS 2008 - 21st International Conference on Micro Electro Mechanical Systems.
ISBN 978-1-4244-1792-6
We present a new microvalve that can be monolithically integrated in centrifugally driven lab-on-a-chip systems. In contrast to existing operation principles that use hydrophobic patches, geometrically defined capillary stops or siphons, here we present a pneumatic principle. It needs neither additional local coatings nor expensive micro sized geometries. The valve is controlled by the spinning frequency and can be switched to be open when the centrifugal pressure overcomes the pneumatic pressure inside an unvented reaction cavity. We designed and characterized valves ranging in centrifugal burst pressure from 6700 Pa to 2100 Pa. Based on this valving principle we present a new structure for aliquoting of liquids. We experimentally demonstrated this by splitting 105 muL volumes into 16 aliquots with a volume CV of 3 %.
Proceedings of the 21st IEEE International Conference on Micro Electro Mechanical Systems.
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Institute of Electrical and Electronics Engineers. ISBN 978-1-4244-1792-6