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. 2016 Dec 12;10:81. doi: 10.1186/s13065-016-0228-2

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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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Fig. 3 — FESEM images of (a) SWCNT-COOH, (b) SWSB-T20, (c) SWSB-T80, (d) SWSB-PEG and (e) SWSB-CS at magnification 100 k×