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. 2018 Apr 30;8:6751. doi: 10.1038/s41598-018-25026-2

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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) The correlation between the number of trapped particles, the ionic strength of the solution, and the pipettes’ diameter. Each experiment was conducted under 10 V/cm with positive bias applied at the base of the pipette and the data was collected after 100 seconds of applied voltage. (b) The correlation between the number of trapped particles and the run time. The COOH-PS beads were suspended in 10 mM KCl pH 7.0, and 10 V/cm was applied at the base of the 2 μm pipette.