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SEM images of AAO—top view (upper row) and nanoconcaves left on aluminum surface after AAO dissolution (lower row) for the samples anodized for 7 h, at 5 °C, 300 V, five times in a row in the same 0.25 M malic acid solution; in the right corners of the SEM images presented in the upper row, photographs of the samples after anodization are shown (in grey frames).
