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Typical scheme of flow-focusing microfluidic device. An orifice is placed at a distance Hf = 250 μm downstream of three coaxial inlet streams. Water is supplied to the two side channels which have widths Wo = 120 μm; monomer is forced into the central channel which has a width Wi = 100 μm. The width of the orifice is D = 80 μm; the width of the downstream channel is W = 240 μm (Nie et al. 2008 [68]; with kind permission from Springer Science + Business Media)
