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کلیسم فسفات آمورف
However, there are some synthetic parameters that need to be implemented, such as the presence of amorphous calcium phosphate within the coating, which might pro- mote anomalous resorption rates; the adherence of the ceramic coating to the metal- lic substrate; the instability of hydroxyapatite at high temperatures; or the phase
This layer then attracts calcium, phosphate, and carbonate ions from the physiological solution to form an amorphous calcium phosphate layer, which crystallizes into biologically active hydroxycarbonate apatite nanocrystals.
On the other hand, P2O5-free sol-gel glasses contain an excess of Ca2+ ions within the glass network that can be interchanged with physiological fluids, which leads to the previously men- tioned enrichment of the surface with silanol groups and calcium supersaturation of the medium, which favors and accelerates the amorphous calcium phosphate forma- tion, as observed in the electronic transmission micrographs at the left-hand side of Figure 1.10.
The 31P solid-state NMR results provided evidence that the presence of CaO and P2O5 in 85SiO2-10CaO-5P2O5 MBG leads to the formation of amorphous calcium phosphate (ACP) clusters that accumu- late onto the material surface (Figure 1.16).
2.0 -6.7 ACP
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