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. 2017 Aug 14;7:8018. doi: 10.1038/s41598-017-07771-y

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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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(a) SEM images of CNCs used during hydrogel generation for DIW processing. (b) After DIW 3D printing followed by freeze drying, an ear model without needing support material was successfully fabricated using 20 wt% CNC gel and 500 µm nozzle tip. (c) Macroporous structure of the aerogel was confirmed by SEM analysis. (d) CNC, in a highly closed packed manner, that constituted the aerogel structure are also illustrated.