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. 2017 Nov 27;7:16414. doi: 10.1038/s41598-017-16649-y

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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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FE-SEM images and recovery rates of the exfoliated GO produced by shearing stress reactor: Inner cylinder rotating speed of (a) 500 rpm, (b) 1000 rpm, and (c) 1500 rpm with exfoliation time of 1, 3, and 5 hr, respectively. Flake size distributions from each condition is provided in the histogram. Photograph: GO dispersion in water after the centrifugation. Precipitates indicate the non-exfoliated GtO flakes.