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. 2018 Oct 19;8:15518. doi: 10.1038/s41598-018-33495-8

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© The Author(s) 2018

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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Contact angle measurements of (1) PDMS, (2) the two different geo-material PDMS chips, and (3) their respective rocks without PVA (−PVA) and with PVA (+PVA). The colours of the points correspond to the different materials present. PDMS is shown as black, geo-material PDMS is red, rock slices are blue and Cassie’s equation estimates for the geo-material PDMS is yellow.