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. 2021 Aug 13;7:61. doi: 10.1038/s41378-021-00288-5

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© The Author(s) 2021

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 — a Initial state of particles in the same volume of water droplet (4 μL) prior to acoustic actuation, where the particles are randomly distributed. b Clustering of particles to the center of the sessile droplet after acoustic treatment using an input RF signal with 33 dBm (±2 dBm) input power. c Enlarged view of the particle cluster above the TPoS MEMS resonator for the different particle diameters (differentiated according to dye color) tested.