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. 2015 Apr 23;19:12. doi: 10.1186/s40824-015-0033-3

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© Lee et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Morphologies of the surface (A, C, E) and x-section (B, D, F) of 5% CMC-PEO hydrogel in dry state (A, B) and porous gel films (C to F), which were fabricated by gas foaming of ammonium bicarbonate with the sizes of 150–180 (C, D) and 250–350 (E, F) μm by employing the 12% (C, E) and 18% (D, F) polymer solutions, respectively.