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. 2020 Jun 15;6:27. doi: 10.1038/s41378-020-0136-4

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — a A microfluidic mixer consisting of the inlet/outlet, channel, junction, and spiral channel blocks. Enlarged images of dye solution flow before entering (b) and leaving (c) the spiral channel block (scale bars: 2 mm). d Yellow value distribution in the microfluidic channel with changing distance along the dashed lines. e A water-in-oil droplet generator consisting of the inlet/outlet, channel, junction, and planar chamber blocks. f Droplet size variance when changing the water/oil flow rate ratio