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. 2014 Jul 18;7(7):5225–5253. doi: 10.3390/ma7075225

Figure 4.

Figure 4

(a) The evolution of the porosity with the pore widening time for different anodization voltages; (b) The thickness of the nanoporous anodic alumina (NAA) layers as a function of the charge spent in the anodization process. Adapted with permission from [38].