Biomedical Engineering Reference
In-Depth Information
-100
-110
-200
-150
-100
-50
0
Chemical Shift / ppm
Fig. 14.
29
Si NMR spectrum of the sample dried at 50°C.
O
-
O
Si
Si
O
O
O
O
O
O
Q
4
Q
3
Fig. 15. Schematic representation of the Q
3
and Q
4
structures.
O
Al
O
Al
Si
Si
Si
O
O
Si or (Al)
Al
O
O
Si or (Al)
O
O
Al
SI
Q
4
(3/4 Al)
Q
4
(1/2 Al)
Fig. 16. Schematic representation of the Q
4
(3/4 Al) and Q
4
(1/2 Al) structure.
