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. 2014 May 6;5:3777. doi: 10.1038/ncomms4777

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(a) Schematic showing experimental set-up used to observe the insertion of red-dyed solvent into blue droplets: a two- or three-phase stream of blue-dyed ODE droplets is first generated by flowing ODE/PFPE or ODE/PFPE/Ar through a PTFE conjunction, then a stream of red-dyed ODE (Q_R2) is injected into the flowing droplets using a T-junction. (b–e) Representative images of the flowing droplets before and after solvent addition for the two- and three-phase flows.