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. 2018 Mar 28;9:1254. doi: 10.1038/s41467-018-03596-z

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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. 3 — Parameters governing surface charge influence on the lateral D_app shift. Plot of the relative lateral D_app shift for different device surface, bead surface, and buffer media at different ionic concentrations. The shift is calculated relative to native PDMS control. A positive shift would mean an increase in D_app across all ionic concentration levels. Each data point was plotted based on at least 50 sample counts and the error bar represent the SD of the sample D_app