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TEM images of solid Stöber silica nanoparticles (A, E), MCM-41 mesoporous silica nanoparticles (B, F), mesocellular foam silica nanoparticles (C, G), and exosome-like silica nanoparticles (D, H) (Adapted from reference31). (I) Multifunctionality of silica nanoparticles. PEG is polyethylene glycol.
