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. 2021 Feb 11;9:13. doi: 10.1038/s41413-020-00130-0

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© The Author(s) 2021

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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Fig. 1 — Material characterization of SF substrates with different β-sheet contents. a, b FTIR absorbance spectra (a) of the amide I region (between 1 695 and 1 595 cm⁻¹) obtained from different SF substrates and (b) the β-sheet contents calculated by Fourier self-deconvolution from these spectra. c Surface topography observed by SEM and AFM. d Surface roughness values analyzed by AFM. e, f Surface wettability (e) determined by water contact angle measurement and (f) representative images of water droplets. Error bars represent one standard deviation. (*P < 0.05 and **P < 0.01)