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Droplet actuation and hydrogel discs in digital microfluidics: A series of images from a movie (top-to-bottom) depicting the merging of a 2 μl droplet with an immobilized gel disc, followed by dispensing of a portion of the volume. The red asterisks (*) denote which electrode was activated in each frame. The gel disc contains a suspension of 2 μm diameter beads to make it visible.
