Biomedical Engineering Reference
In-Depth Information
Usingthesamestartingmaterialsandthesameprocess,Yang
et al
.
29
haveobtainednanotitanatescomposedofNa
2
Ti
2
O
4
(OH)
2
usingthe
following hydrothermal reaction:
2TiO
2
+
→
2NaOH
Na
2
Ti
2
O
4
(OH)
2
(3.3)
Robert Armstrong proposes that hydrothermally synthesized nano
titanates are sodium hydrogen titanates with a general formula of
Na
y
H
2
−
y
Ti
n
O
2
n
+
1
·
x
H
2
O.
30
Our results confirm that these 1D nano
titanates produced by the reaction between the matrix scaffold and
the concentrated alkaline solution are composed of a predominant
phase of Na
2
Ti
2
O
5
·
H
2
O and traces of other phases.
16
In the case
of porous Ti-based scaffolds produced by PM, the hydrothermal
reaction mechanism is more complex because the metallic Ti and
surface native titanium dioxides may react with the concentrated
alkaline solution. In addition, our investigation discloses that these
1D nanowires/nanobelts grown on the scaffold are unstable under
high-energy electron impact.
16
As shown in the TEM picture in Fig.
3.9,thelengthofthese1Dnanobeltsonthesurfacecanreach10
μ
m.
Figure 3.9.
TEM image of single 1D nanobelt of titanate scratched from
the hydrothermal-treated Ti-based metal scaffold.
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