Abstract
We describe the step-by-step formation process of picoliter to femtoliter volume of microdroplets by using a mechanical valve. An experiment-based theoretical model has been proposed through a parametric study of droplet formation in a microchannel with variations of the channel height, the working pressure to drive the liquids in the microchannels, and the viscosity of the dispensed phase. Three steps in the process of droplet generation have been depicted. The present study provides a clear understanding of the droplet generation process based on physical cutting method by using a mechanical valve and could be applied to advanced design for highly flexible droplet-based microfluidic systems.
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