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. 2019 Jan 16;9(1):107. doi: 10.3390/nano9010107

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a–c) Visual appearance of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibril (TOCN) films, TOCNs/ TEMPO-oxidized wood fibers B (TOWFs-B), and TOCNs/TOWFs-C films in close contact with underneath color pattern. (d–f) Digital photographs of TOCN films, TOCNs/TOWFs-B films, and TOCNs/TOWFs-C films were lifted up to 6 cm above color pattern.