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. 2017 Sep 11;7:11129. doi: 10.1038/s41598-017-11649-4

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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) Storage modulus measured @ 1 Hz for gels formed using 100 mM of different cations versus sonication time. Lines are guides for the eyes. (b) G′ vs the ratio of cation valence over cation radius for samples sonicated 240 s. The red line is the linear fit of the data.