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. 2018 Aug 21;9:3260. doi: 10.1038/s41467-018-05749-6

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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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Fig. 5 — Anti-diffusion and sorting of non-magnetic beads using the microswarm. a The anti-diffusion effect induced by a ribbon-like microswarm in a microchannel. b Sorting 70 μm-diameter beads out from 15 μm-diameter beads in a channel using the microswarm. The 70 μm-diameter beads are labelled in the red ellipses, while some of the 15 μm-diameter beads are labelled in the green ellipse. One part of the small beads are pushed aside by the flow generated at the tip of the microswarm, as shown by the green arrows. The other part of the small beads are first attracted into the swarm, and then they are pumped out at some locations near the swarm tip, as shown by the green dotted arrows