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. 2018 Feb 26;8:3647. doi: 10.1038/s41598-018-21957-y

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© The Author(s) 2018

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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SEM images of magnetic capsules, both precursor capsules (A) and after growth of the SiO_x nanoparticles (C). The capsules contained surface modified SPION. (B) TEM image of coated SPION nanoparticles. The nanoparticles were coated with a 4 nm thick OTES coating, rendering their surface hydrophobic. (D) The EDS spectrum for the (precursor) capsules in (A). The presence of Fe, due to SPION nanoparticles, is evident. The EDS spectrum for capsules in (C) is found in Figure S7 in SI.