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. 2018 May 10;10(5):517. doi: 10.3390/polym10050517

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© 2018 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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TEM images of unmodified CNF and surface modified CNF, respectively, to show the morphological differences arising due to the surface modification by ball milling (reproduced with the permission from [246]).