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. 2014 Jun 2;5:4018. doi: 10.1038/ncomms5018

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(a,b) Schematic drawing and photo of the flow cell, respectively, where the scale bar in b is 10 mm. (c) Image of the focusing region of the channel, where the flow is directed downwards and the scale bar represents 1 mm. Water is focusing an ink–water mix. (d) A schematic drawing of the flow focusing part. (e–g) Images of the ejected jet, where water is focusing CNF in e and a NaCl solution is used to focus CNF in f,g. A higher acceleration is used in g compared with f.