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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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Different volume ratio of ATPS, 20:1 PEG-rich phase: Dx-rich phase from 15%/15% w/w PEG-Dx stock ATPS. Confocal Microscope images of clay particles with fluorescent-labeled Dx (red) and PEG (green) added to aid visualization of Dx-rich phase droplets and continuous PEG-rich phase. Right images show overlay of fluorescence channels and left images show transmitted light for samples containing: (A) Kaolinite, (B) Na-rich montmorillonite, (C) Ca-rich montmorillonite and (D) illite in PEG-Dx ATPS.