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High-magnification SEM micrographs showing the different appearance and density of the nanostructures (horizontal field widths of 2.98 μm 1.19 μm and 597 nm, respectively) of (a column) ABT, (b column) Nano and (c column) Nano H2O. The magnifications are 100,000×, 250,000×, 500,000×, respectively for the first, second and third line of photos.
