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[Top] Optical Microscope images of double junction droplet maker device and [Bottom] SEM micrographs of features obtained using a two layer photolithography process. (a) Image of droplet maker device, (b) water-ethanol droplets were formed using a block-copolymer surfactant, (c) and (d) show PDMS replica of well aligned channels obtained using the alignment procedure detailed in the paper. The scale bar is 100 μm.
