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Preparation of multifunctional magnetic nanobubbles (MF-MNBs). (A) Schematic illustration of the fabrication process of MF-MNB. (B) TEM image of SPIO nanoparticles. (C,D) SEM and TEM image of MF-MNB. (E) EDS spectrum curve of Fe, O, and N elements in MF-MNB.
