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. 2018 Mar 19;8:4791. doi: 10.1038/s41598-018-22756-1

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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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(a) Schematic of assembled active control device with PCU module and the illustration of the co-flow structure. (b) A printed sample of the assembled active control device. (c) High-speed video frames showing active control of W/O/W double emulsions with different encapsulated number of inner droplets. (d) Photographs of the different W/O/W double emulsions. (e) Plot of the generation frequency of the outer droplet at downstream versus the excitation frequency. Points with cross inside represent natural frequencies. (f) Plot of the encapsulated droplet number corresponding to the ratio of the excitation frequency and the generation frequency of outer droplets.