We present a new microvalve that can be monolithically integrated in centrifugally driven lab-on-achip systems. In contrast to existing operation principles that use hydrophobic patches [1], geometrically defined capillary stops [2] or siphons [3], here we present a pneumatic principle. It needs neither additional local coatings [1] nor expensive micro sized geometries [2]. 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 μL volumes into 16 aliquots with a volume CV of 3 %.
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