Nanostructured Titania Coatings for Biological Applications: Fabrication and Characterization - Biological and Biomedical Coatings: Processing and Characterization - page 223

×100,000 100 nm

FIGURE 5.19
A typical SEM view of nanonetwork titania coating on titanium fabricated by anodization in high concentration
of NaOH solution. (From Yang et al., J. Alloy. Compd. , 479, 642-647, 2009. With permission.)

Ti to a concentrated NaOH solution. Figure 5.20 shows the cross-sectional view of this
type of porous structure. The pore size increases with the NaOH concentration but it is
not affected much by the treatment time (1.5-15 M/L). The pore size is also progressively
enhanced compared to the anodization method. TEM view discloses that the net has a
nanotubular structure 200 to 300 nm long and about 10 nm in diameter. SAD patterns

(a)

(b) (c)

20 nm

FIGURE 5.20
TEM views of one type of network structure on pure Ti after exposure in concentrated KOH for 10 h. (a) Cross-
section views, (b) views of single net, and (c) SAD pattern of single net in (b). (From Lee et al., Curr. Appl. Phys. ,
9, e266-e269, 2009. With permission.)