. 2018 Aug 14;10(35):16601–16612. doi: 10.1039/c8nr02418a

Table 1. Average thickness, inner diameters and aspect ratios of the different TiO₂ nanotube layers (TNTs) together with the corresponding anodization process conditions: electrolyte, potential or current applied, and anodization process time.

Average thickness (μm)	Average inner diameter (nm)	Average aspect ratio	Electrolyte composition	Anodization potential (V)	Anodization current (mA)	Anodization time (min)	Average number of TNTs (cm^–2)	Total surface area of TNTs on 1 cm² of substrate (cm²) ^a
1	80	13	Glycerol + H₂O (50 : 50 vol%), 270 mM NH₄F	20	—	100	66 × 10⁸	16.5
5	230	22	Ethylene glycol, 10 vol% H₂O, 150 mM NH₄F	100	—	240	12 × 10⁸	44
20	130	154	Ethylene glycol, 1.5 vol% H₂O, 176 mM NH₄F	60	—	240	46 × 10⁸	377
60	130	461		—	7.5	180	45 × 10⁸	1080
90	130	692		—	10	180	48 × 10⁸	1776
130	145	897		—	15	180	37 × 10⁸	2183

^aThe total surface area of the nanotubes was estimated from the average values of the inner diameter and the number of nanotubes calculated statistically from the SEM images. The anodized area of the Ti substrate was 1 cm².

Table 1. Average thickness, inner diameters and aspect ratios of the different TiO2 nanotube layers (TNTs) together with the corresponding anodization process conditions: electrolyte, potential or current applied, and anodization process time.

Table 1. Average thickness, inner diameters and aspect ratios of the different TiO₂ nanotube layers (TNTs) together with the corresponding anodization process conditions: electrolyte, potential or current applied, and anodization process time.