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SEM images of the measured silica nanoparticle samples of different sizes. (A) 70 nm silica nanoparticles, (B) 100 nm silica nanoparticles, (C) 200 nm silica nanoparticles, (D) 300 nm silica nanoparticles, (E) 500 nm silica nanoparticles, and (F) 800 nm silica nanoparticles.
