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SEM micrographs illustrating the surface topology and roughness of (a column) ABT, (b column) Nano and (c column) Nano H2O discs at high magnification (horizontal field widths of 59.7 μm, 29.8 μm and 5.97 μm, respectively). The magnifications are 5000×, 10,000× and 50,000×, respectively for the first, second and third line of photos.
