Anodization of Titanium Experimental Aspects

The formation of the Ti02 nanotubes by anodization follows several distinct phases that can be observed during the anodization experiment directly by following the change of colors of the titanium layer or by following the current response of the anodization cell. For the latter, the current response of the cell as function of the time is shown in Fig. 5.4. 

In fact, the growth and dissolution of the oxide layer continues hut is much slower at this stage. During this stage, the initial compact layer (that has become porous meanwhile) is completely etched off the surface of the Ti02 nanotubes. SEM pictures of the resulting titanium dioxide nanotubes are shown in Section 5.4. 

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