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. 2015 Mar 2;8(3):850–866. doi: 10.3390/ma8030850

Figure 2.

Figure 2

Scanning electron microscopy (SEM) images at high magnification showing nanoscale structures formed on 30-min etched surfaces (100,000× magnification, bar = 100 nm): (a) 10F30; (b) 20F30; (c) 30F30. Such nanostructures were not evident on the 5-min etched surfaces.