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Conceptual graph of PEGylated monocrystalline SPIO nanoparticles (SPIO@PEG) with various nanocrystal sizes (d) and surface PEG lengths (l). In our research, three SPIO crystal particles (4, 6, and 8 nm) and three PEG (Mn = 550, 2k, or 5k Da) were used to prepare nine SPIO@PEG nanoparticles.
