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شیشه سل-ژل
1.4.1.2 Sol-Gel Glasses
The most investigated sol-gel glass composition is that of CaO-P2O5-SiO2 (Vallet- Reg�, Romero et al. 1999; Vallet-Reg�, Arcos, and Perez-Pariente 2000; M.
FIGURE 1.9 Schematic representation of the whole sol-gel process (top), and application of sol-gel chemistry for the production of pieces of sol-gel glasses.
In the same way, the presence or absence of P2O5 within bioactive sol-gel glasses has a strong influence on the bioactive behavior, as is described in Figure 1.10 (Salinas, Martin, and Vallet- Reg� 2002).
In sol-gel glasses produced with P2O5, the Ca2+ ions are retained in the glass network because of the interaction with phosphate groups, which impedes the media supersaturation in Ca2+ and surficial silanol concentration increase, leading to a reduction on the bioactive kinetics.
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