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. 2019 Sep 24;9:13737. doi: 10.1038/s41598-019-50153-9

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© The Author(s) 2019

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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Effects of the hydrophilic polyelectrolyte coating. A DI water sessile drop rests on (a) an untreated PDMS surface with a contact angle of 110°; on (b) a deconstructed microchannel functionalized using the polyelectrolyte multilayer with a contact angle of 20°. Crude oil water interface in an (c) untreated and (d) treated microchannel filled with water resulting in oleophilic (c) and oleophobic (d) contact angle respectively. Scales: 1 mm in (a,b); 100 μm in (c,d).