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. 2018 Mar 27;16:30. doi: 10.1186/s12951-018-0350-5

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Characterization of nanoparticles: a UV–Vis absorption spectra of cRGD, PAA-cRGD and PAA in water, b N₂ adsorption (hollow)–desorption (solid) isotherms (inset: pore size distribution from adsorption branch) of Fe₃O₄@SiO₂@PAA-cRGD NPs, c FT-IR spectra of Fe₃O₄@SiO₂ NPs, Fe₃O₄@SiO₂@PAA-cRGD NPs and PAA, d Magnetization vs. applied magnetic field for Fe₃O₄, Fe₃O₄@SiO₂, and Fe₃O₄@SiO₂@PAA-cRGD NPs at 300 K