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(a) Photograph of a three-phase flow comprising octadecene droplets, argon gas bubbles and a perfluorinated polyether carrier fluid, passing through 1 mm inner diameter PTFE tubing. (b) A sequence of still images showing the direct injection of red-dyed octadecene into blue-dyed octadecene droplets, using Ar gas as a spacer and PFPE as the carrier fluid.
