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. 2018 Jun 8;8:8763. doi: 10.1038/s41598-018-27037-5

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© The Author(s) 2018

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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Effect of flow rate and channel size on droplet size. Droplet generator channels are shown at left. Scatter plots at right show the effect of oil and water flow rate on droplet diameter. A 200 µm scale bar is shown in the bottom right. The size of the outlet channel in which droplets were generated was (A) 210 μm, (B) 298 μm, and (C) 156 μm at the base of the triangular channel profile. Flow rate combinations that produced oscillating droplet diameters are represented as concentric circles in the scatter plot, with circle size proportional to the range of droplet sizes produced.