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. 2021 Jul 6;9:711534. doi: 10.3389/fbioe.2021.711534

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Copyright © 2021 Chung and Zhang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Physicochemical characterization of NPCP and CNPCPs. TEM images of (A) NPCP (synthesized without CD-CP), and (B) CNPCPs. CDs (circled with white dashed circle) can be found surrounding the iron oxide core of CNPCP (yellow) (inset). Scale bar = 20 nm, 5 nm in inset) (C) Hydrodynamic sizes and (D) zeta potentials of NPCP and CNPCP. (E) FTIR spectra of CD-CP and CP. (F) Fluorescence emission of CNPCP solution before (CNPCP) and after (supernatant) magnetic separation of CNPCP from the solution.