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. 2016 Aug 3;6:31009. doi: 10.1038/srep31009

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(A) TEM image of Combo NP. Scale bar, 50 nm. Insert: Schematic illustration of Combo NP structure described in this article. (B) EDX mapping images of Combo NP, indicating the co-existence of Fe and As in SiO₂ shell. Releasing profiles of (C) As and (D) DOX from Combo NP at different pH values.