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(A) Schematic of a typical capillary microfluidic device geometry and generation of double emulsion droplets; (B) schematic of ill-controlled fluid flow with increasing difference in the flow rates of the outer and middle phases when the viscosity of middle phase is 27.5 times higher than that of the outer phase; (C) schematic of the modified capillary microfluidic device geometry; and (D) comparison of the typical and modified device geometries.
