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. 2020 Jan 2;13(1):184. doi: 10.3390/ma13010184

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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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Chemical composition of the surface of (a) pure Fe; (b) Fe-PEI1; (c) Fe-PEI2; and (d) Fe-PEI3 samples studied by the energy dispersive X-ray analysis (EDX) method.