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Bioactivity and structural properties of nanostructured bulk composites containing Nb2O5 and natural hydroxyapatite
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10.1063/1.4809653
/content/aip/journal/jap/113/22/10.1063/1.4809653
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/22/10.1063/1.4809653

Figures

Image of FIG. 1.
FIG. 1.

Schematic representation of the depth profile inspection of the precipitated layer, as determined by confocal Raman spectroscopy.

Image of FIG. 2.
FIG. 2.

XRD patterns of the HAp and NbO precursor powders and of the composites (vol. %) (x) HAp + (100-x) NbO (x = 10, 20, 30, 40, or 50) that were sintered for 1 h at 1000  °C: (+) HAp, (•) NbO, (x) CaNbO, (◇) PNbO, and (○) β-TCP.

Image of FIG. 3.
FIG. 3.

Experimental and calculated XRD patterns of the composite (vol.%) (50) Hap + (50) NbO.

Image of FIG. 4.
FIG. 4.

Raman spectra of the composites (vol. %) (x) HAp + (100-x) NbO (x = 10, 20, 30, 40, or 50) that were sintered at 1000 °C for 1 h.

Image of FIG. 5.
FIG. 5.

Morphology of the composites (vol. %) (x) HAp + (100-x) NbO (x = 10, 20, 30, 40, or 50) before and after 28 days of immersion in the 1.5 SBF: surfaces before immersion (a, i = 1–5), surfaces after immersion (b, i = 1–5) and the cross-sections of the precipitated layers after immersion (c, i = 1–5).

Image of FIG. 6.
FIG. 6.

FTIR spectrum of the biomimetic precipitated layer on the surface of the composite (vol. %) 30 HAp + 70 NbO after 28 days of immersion in the 1.5 SBF.

Image of FIG. 7.
FIG. 7.

XRD patterns of the composites (vol. %) (x) HAp + (100-x) NbO (x = 10, 20, 30, 40, or 50) after 28 days of immersion in the 1.5 SBF; (x) CaNbO, (◇) PNbO, (○) β-TCP, and (*) HCA.

Image of FIG. 8.
FIG. 8.

Raman spectra of the composites (vol. %) (x) HAp + (100-x) NbO (x = 10, 20, 30, 40, or 50) after 28 days of immersion in the 1.5 SBF. The spectra were measured at different depths throughout the precipitated layer.

Image of FIG. 9.
FIG. 9.

A/A ratio of the Raman spectra as a function of the depth in the samples (vol. %) (x) HAp + (100-x) NbO (x = 10, 20, 30, 40, or 50) after 28 days of immersion in the 1.5 SBF. The exponential fit is also shown.

Tables

Generic image for table
Table I.

Lattice parameters, weight fraction (%) and the R-factors of different phases obtained from Rietveld refinement.

Generic image for table
Table II.

Thicknesses of the precipitated layers determined by the confocal Raman spectroscopy for the (vol. %) (x) HAp + (100-x) NbO composites after 28 days of immersion in 1.5 SBF.

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/content/aip/journal/jap/113/22/10.1063/1.4809653
2013-06-12
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Bioactivity and structural properties of nanostructured bulk composites containing Nb2O5 and natural hydroxyapatite
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/22/10.1063/1.4809653
10.1063/1.4809653
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