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. 2020 Apr 2;10(4):667. doi: 10.3390/nano10040667

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© 2020 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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Image of the prepared powders in N-Methyl pyrrolidone (NMP) with the concentration of 0.1 mg/mL: the products were only obtained by ball milling without Fe₃O₄ nanoparticles (OBPs, Marked by the number 1), the products were obtained by the two-step method without Fe₃O₄ nanoparticles (BHPs, Marked by the number 2), the BFPs (marked by the letter F) and the FLG (marked by the letter H).