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. 2016 Oct 7;6:34061. doi: 10.1038/srep34061

Figure 2.

Figure 2

(a) The absorption spectra for Methylene Blue dye adsorption shows an enhancement for the 30 V anodized needle. (b) Change in needle surface area as a function of anodization voltage, with the 30 V anodized needle showing a maximum result.