Download Bioceramics: Materials and Applications IV, Volume 147 PDF

ISBN-10: 1118406060

ISBN-13: 9781118406069

ISBN-10: 1574982028

ISBN-13: 9781574982022

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Extra resources for Bioceramics: Materials and Applications IV, Volume 147

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Thin film XRD is needed for further characterization of the coating crystal structure. Besides the continuous crack-free coating, CaP minerals can also be formed into patterns on a substrate by combining ECD with photolithography. Figure 4 shows combined optical microscopy and EDX element mapping results of a deposited CaP coating with negative patterns on titanium, where arrays of circular titanium dots are surrounded by CaP coating. This is clearly confirmed by the Ti, Ca and P element mapping.

The mechanism of heterogeneous nucleation and growth of hydroxyapatite on substrates in aqueous solutions is still the subject of some debate. Since the early bioactive glasses and glass-ceramics contained both CaO and P2O5, it was believed that these two constituents were essential for the formation of hydroxyapatite on the surfaces of substrates. Hench [7] has described a five-stage reaction mechanism for the formation of crystalline hydroxyapatite on the surfaces of bioactive glasses containing CaO and P2O5.

This is clearly confirmed by the Ti, Ca and P element mapping. Under optical microscope (Fig. 4a), the uncoated part appears bright as contrasted to the dark coating. This is because of the micro-porous morphology of the coating does not reflect light as well as the relatively smooth titanium surface. Positive patterns (arrays of CaP islands in the titanium background) of various Bioceramics: Materials and Applications IV 55 Sä« Sri «Ire j v . j . -. '! \ -■■■ J ^J 0 twin» (c) 10tV-n (d) Fig. 1 Morphology of the CaP coating Coots T 4000- 5 P 2000 - Ca j c JM 0 2 4 1 l«M 6 t kiV Fig.

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Bioceramics: Materials and Applications IV, Volume 147


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