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(1) Pneumatic control of droplet formation through a 3D-printed flexible membrane. (2) Pneumatic control of droplet sorting through a 3D-printed flexible valve. (3) Droplet coalescence in a 3D-printed channel consisting of a top layer for flow drainage and a bottom rail layer for droplet guide. (4) Droplet deformation, release and coalescence in a 3D-printed channel through an external electric field. Reproduce of [83,92,93,94].
