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Different advancing (dotted square) and receding (dotted circle) menisci of segmented aqueous droplets flowing in (A) pristine and (B) fluorinated PMMA microchannels. FC-3283 was used as the carrier fluid using a volume flow rate of 10 μL min−1 and the dispersed fluid at 2 μL min−1. Arrows denote the flow direction. Magnified and enhanced images are shown on the far left of the figures. Section B and part of section C of the microfluidic device shown in Figure 1 are shown here.
