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. 2017 Nov 8;7:15078. doi: 10.1038/s41598-017-15287-8

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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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Characterization of Fluoropor bulk nano-/microstructured polymer foam. (a) Fluoropor is a soft material and a substrate of 820 µm thickness is very flexible. (b) The wear resistance of Fluoropor was measured using a tribometer (schematic inset). After a break-in phase of ~50 cycles, a coefficient of friction of µ = 0.2 was determined (µ = F_R/F_N). (c) A 5 µL droplet of water bounces off a Fluoropor surface (time passed between frame 1 and frame 9: approximately 2.6 s). (d) The static contact angle of Fluoropor shows little variation at various droplet volumes and was determined to be an average of 163.7 ± 6.8°. (e) Advancing and receding contact angle measurements of Fluoropor gave 158.0 ± 7.9° and 151.9 ± 1.9°, respectively. The receding contact angle decreases due to evaporation of the droplet over time.