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Electron microscopic images of NMBGs. (a) Group-61 nm, (b) Group-174 nm, (c) Group-327 nm, (d) Group-484 nm, (e) Group-647 nm, (f) Group-743 nm, (g) Group-990 nm, (h) Group-1085 nm and (i) Group-77 S. (a–h) are TEM images and (i) is an SEM image. SEM was used to image Group-77 S due to its large particle size.
