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. 2016 Mar 16;17(1):80–88. doi: 10.1080/14686996.2016.1145530

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© 2016 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis

This is an Open Access article distributed under the terms of the Creative Commons Attribution License CC-BYhttp://creativecommons.org/licenses/by/4.0/which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 4. — XRD patterns of (a) acid-resistant magnetic Fe₃O₄ nanoparticles; (b) acid-resistant magnetic Fe₃O₄ nanoparticles contacting with 1 M HCl for 24 h; (c) acid-resistant magnetic Fe₃O₄ nanoparticles contacting with 3 M HCl for 24 h.