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. 2017 Jun 12;7:3215. doi: 10.1038/s41598-017-03033-z

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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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Clay distribution in ATPS with higher polymer concentration. Optical microscope images showing clay particles with 20:1 volume ratio of a stock 20%/20% w/w PEG/Dx ATPS. Left-hand images show transmitted light, and right-hand images show overlay of red and green confocal fluorescence channels for samples containing: (A) Kaolinite, (B) Na-rich montmorillonite, (C) Ca-rich montmorillonite and (D) illite. Fluorescent-labeled Dx (red) and PEG (green) have been included to aid visualization of the Dx-rich phase droplets and PEG-rich continuous phase.