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. 2016 Oct 13;13:54. doi: 10.1186/s12989-016-0166-0

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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. 1 — Optical microscope and TEM micrographs of CNT suspensions at 1.0 mg/ml concentration. a Optical microscope before and after dispersion by a cup-type sonicator at 100 W, 80 % pulse mode, for 10 min twice. b Transmission electron microscope (TEM) micrographs of SWCNTs and DWCNTs dispersed in the dispersion medium. The areas, which include well-dispersed CNTs, were highlighted within the dotted lines. SWCNT: single-walled carbon nanotube, DWCNTs: double-walled carbon nanotube