Biomedical Engineering Reference
In-Depth Information
(a)
(b)
Figure12.1
Picturesof(a)as-preparedTyzor-LA-CNXLcompositefilmand(b)titaniaproduct
after calcination at 500
◦
C in air (reprinted with permission from ref 24). Copyright 2007
Elsevier.
(b)
(a)
10
20
30
40
50
60
2
q
Figure 12.2
XRD patterns of (a) as-prepared and (b) calcined Tyzor-LA-CNXL composite
(reprintedwithpermissionfromref24).Copyright2007Elsevier.
peaks at 2
θ
of 25.39, 38.05, 48.23, 54.04, 55.34, 62.97, 69.07, 70.61, and 75
.
21
◦
that
correspond to (101), (004), (200), (105), (211), (204), (116), (220), and (215). The
calculated size of the titania using Sherrer's equation is in the range of 5-7 nm (26).
FT-IR spectrum (not shown here) of CNXL shows that a broad absorption peak near
3500 cm
−
1
is for hydroxyl group and the bands at 2970.9, 2909.4, and 2863.3 cm
−
1
The band at 1649.7 cm
−
1
are for C
−
H stretching vibration of CNXL backbone.
=
is for oxidized carbon (C
O) of CNXL. However, the band for hydroxyl group of
Tyzor-LA-CNXL composite became weak due to the loss of hydrogen bonding. Aliphatic
C
H stretching vibration bands of CNXL are at 2981.1, 2929.9, and 2868.5 cm
−
1
.An
additional C
=
O stretching vibration band appeared at 1588.2 cm
−
1
−
due to the formation
After calcination at 500
◦
C in air the broad band between
Tyzor-LA-CNXL complex.
1000 and 500 cm
−
1
O (27).
SEM images (Figure 12.3a,b) show that the as-prepared Tyzor-LA-CNXL composite
has rodlike CNXLs coated with Tyzor-LA and an average of 150-200 nm in length
indicates the stretching vibration of Ti
−
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