Fig. 5: On-demand regulation of the droplet pairing ratio.
From: Self-synchronization of reinjected droplets for high-efficiency droplet pairing and merging

a Micrographs showing the droplet arrangement and merging at the pairing ratios of 1:2 and 1:3. b Stacked bar chart showing the portion of droplets with different pairing ratios at different small-droplet flow rates. c Micrograph showing the arrangement of three sets of droplets at a pairing ratio of 1:1:1. Scale bar: 50 μm