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Optical microscope images of the microreactor tip. (a) Tip during electrospray with different flow rates of a solvent (an 80:20 mixture of acetonitrile:water with 0.1 vol % formic acid). (b) Side micrograph of the tip. The size measurements were obtained by placing an object of known size next to the tip (e.g. a 220-μm diameter silica capillary or an electronic calliper adjusted to 1 mm).
