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. 2019 Mar 28;14:109. doi: 10.1186/s11671-019-2941-y

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© The Author(s). 2019

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.

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Fig. 1 — Characterizations of SiO₂NPs and TiO₂NPs in water. a–d Representative TEM images. b–e Dynamic light scattering (DLS) and c–f ζ-potential measurements. g X-ray diffraction analysis (XRD) pattern of TiO₂NPs