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(A) Photograph of the polydimethylsiloxane (PDMS) microchip. Channel and reservoirs were full of red ink for visualization. (B) Micro photo of the process of microdroplets preparation at cross-junction channel. The velocity of the aqueous phase and oil phase was 14 and 80 μL/min, respectively. (C) Microphoto of microdroplets off-chip. Reprinted from an open-access source [54].
