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Characterization of PB@(Fe3O4@PEG-PLGA) MCs. SEM images of MCs with (A) Low and (B) High magnification; (C) SEM image of one MC cut by a super thin blade; (D) Size distribution; (E) Magnetic property upon exposure to an external magnet; (F) Hysteresis loops. UV–vis spectra of (G) PB NPs in water, (H) PB NPs in water extracted from PB@(Fe3O4@PEG-PLGA) MCs and (I) PB@(Fe3O4@PEG-PLGA) MCs in water.
