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. 2017 Jul 21;7:6099. doi: 10.1038/s41598-017-06257-1

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© The Author(s) 2017

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) An illustration of particle adsorption on polymer hydrogel surfaces, and the chemical structures of the two kinds of gel used. (b) Optical micrographs showing adsorbed colloidal silica particles (silica 1) on polyacrylamide (PAAm) gels in water at three different NaCl concentrations, [NaCl]. (c) Area fraction ϕ of the adsorbed silica particles in water plotted as a function of [NaCl] for PAAm and PDMA gels (black and red circles, respectively). Error bars represent standard deviations. The dashed horizontal line represents the maximum coverage (=0.547) for random sequential adsorption (RSA).