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Finger-powered, hard–soft hybrid micropump. (A) Schematic illustration of the work principle of the hybrid micropump. (B) A photograph of the hard–soft hybrid pump. (C) A sequence of images illustrating the finger-powered pumping process in the hybrid micropump. The water containing food dye was used in this test. (D) The flow rate (µL/min), as a function of function of the compression times (expressed in terms of times per min). n = 3.
