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- W2023648535 abstract "In the present work, we have clarified the detail of the surface transformation reactions of bioactive calcium-phosphate (Ca-P) glass granules induced by in vivo implantation in rabbit dorsal muscle sites. To this aim we have compared the behaviour, during the same implantation, between the as-prepared and gold-coated only-on-one-side glass granules. The deposited gold layer enabled us to determine very precisely the initial position of the surface of the glass before the transformation took place. In addition, since the gold layer acts as a diffusion barrier, it allowed the study of the direction and the mechanism of crystal growth which occurred at the glass surface. Lapped and polished cross-sections of the samples were examined by backscattered electron (BSE) imaging and quantitative (with standards) x-ray energy dispersive spectroscopy (EDS) in a scanning electron microscope (SEM). The observations showed the presence of an interlayered structure. Quantitative EDS microanalysis performed by profiling the electron beam across the samples indicated the presence of hydrated calcium phosphate in the external layer, an inhomogeneous silica-rich gel-type layer in the middle layer, and an unaffected original Ca-P glass in the centre. From the comparison with those granules gold-coated on one side, we deduced that the hydrated calcium phosphate layer grew towards the interior of the granules at the expense of the starting glass. A simple model, based on the balance of the concentrations of the elements which have diffused in the different layers, is proposed to explain the contribution of the elements constituting the original glass to the formation of the different layers. This result agrees with the experimental data obtained from image analysis and the microstructural behaviour of this type of glass is discussed." @default.
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- W2023648535 date "2006-12-06" @default.
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- W2023648535 title "Transformation reactions of partially gold-coated bioactive Ca-P glass granules investigated by analytical scanning electron microscopy" @default.
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- W2023648535 doi "https://doi.org/10.1002/sca.1998.4950200405" @default.
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