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X-ray diffractogram of Fe3O4 NPs coated with PEG and chitosan. The crystal structure of the magnetite (Fe3O4) NPs synthesized via chemical co-precipitation and coated with PEG and chitosan was analyzed. Characteristic X-ray lines of magnetite NPs were observed in both samples. Therefore, the d-spacing values of the significant peaks match well (ICDD DB card number 01-073-9877).
