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(a) Illustration of flow-focusing droplet generating device, where red is the dispersed phase (microdroplets) and blue is the continuous phase (fluid surrounding the droplets). (b) Image of droplet generator device with acrylamide solution serving as the dispersed phase and 1-octadecene + Hypermer 2524 serving as the continuous phase (inset: fluorescent image of polyacrylamide droplets collected from the device outlet).
