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. 2019 Apr 23;9(4):649. doi: 10.3390/nano9040649

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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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Transmission electron microscope (TEM) images of (a) Fe₃O₄@1, (d) Fe₃O₄@2. Particle size histogram with Gaussian fit of (b) Fe₃O₄@1, (e) Fe₃O₄@2. HRTEM of (c) Fe₃O₄@1, (f) Fe₃O₄@2.