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. 2020 Nov 4;10:19004. doi: 10.1038/s41598-020-75798-9

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Schematic representation of the MNP synthesis and their resulting morphology. (a) Synthesis of amino-magnetic nanoparticles (NH₂-MNP). (b) Poly (amino-ester) is synthesized by the combination of 1,4-butanediol diacrylate + 6-aminocaproic acid at DMSO solution via diacrylate-amine polymerization. (c) The final amino-magnetic nanoparticles coated with the Poly (amino-ester) material are synthesized by following a Michael addition methodology⁸ as introduced by Zhao et al.⁵ and represented as Poly-NH₂-MNP in the following. (d) Magnetic nanoparticles dispersion dried on a SiO₂ wafer and placed in ultra high vacuum conditions (UHV, ~ 10^-9 mbar). The observed morphology of this sample reveals a rough compact surface derived from the intrinsic magnetic interaction between the nanoparticles covered with APTES. (e) Final nanostructured magnetic nanoparticles dispersion dried on a SiO₂ wafer and placed in ultra high vacuum conditions (UHV, ~ 10^–9 mbar). The observed morphology of this sample revealed a smooth continuous surface derived from the presence of the polymer on the MNP as active electronegative coating. Insets scale bar 10 µm.