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. 2018 May 2;8(5):294. doi: 10.3390/nano8050294

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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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Transmission electron microscope (TEM) (a,c,e) and high-resolution transmission electron microscope (HRTEM) (b,d,f) images of the powders of the raw anatase TiO₂ (a,b) and the samples 2Si (c,d) and 2Si-N (e,f) milled at the speed of 800 rpm.