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. 2017 Sep 19;8:596. doi: 10.1038/s41467-017-00685-3

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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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Fig. 2 — Structure and principle of operation of the soft composite material. a Microstructure: Illustration and a stereoscope image; scale bar is 1 mm. b Illustration of the expansion process on example of a single ethanol bubble. c Micro-CT images of the material cross-section at room temperature and during heating. d Infra-red images of the material as the heating starts and during expansion; the material is heated using Ni–Cr resistive wire