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sunny1992720

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专业: 物理有机化学

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the soaking time in SBF:
(a) For soaking periods up to 9 days, two zones with
different morphology could be observed on the biphasic
material surface. After one day, SEM micrographs did
not show any kind of coating. For soaking times
between 3 and 9 days two different zones could be
observed by SEM micrographs. EDS analyses were
carried out on 10 different zones with similar look and
22 mm16 mm area, confirming that one of them (zone
II) was composed by Ca and P, whereas the other one
(zone I) was composed by the initial elements (Ca, Fe,
Si, P). Fig. 6 shows the SEM micrographs of both zones,
including the EDS results. The surface in contact with
SBF was heterogeneous, with grains with composition
SiO2.CaO.P2O5 (sol–gel-derived glass) and grains with
composition SiO2.CaO.Fe2O3 (melt-derived glass).Their
crystallinity and particle sizes were also different. On
some zones of the biphasic material surface, grains from
the melt-derived glass (FeG) emerged; their crystallinity,
combined with the absence of P in their composition,
contributed to get lower kinetics of the bioactive
process. These zones corresponded with type I in
Fig. 6. They show bioactive behaviour with very slow
kinetics. For this material it is necessary about one
month to reach a bioactivity similar to the obtained for
the biphasic material soaked only one day in SBF [19].
Type II would correspond, for the first soaking times, to

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