Effect of modification substrate on the microstructure of hydroxyapatite coating

Bioactive hydroxyapatite (HA) coatings were fabricated by a precipitation, sol-gel and dip-coating method. The effects of the aging time and the base used to adjust pH and substrate materials on the phases and microstructures of HA coatings were studied by field emission scanning electron microscopy...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-01, Vol.786 (1), p.12024
Main Authors: Realpe-Jaramillo, J, Morales-Morales, J A, González-Sánchez, J A, Cabanzo, R, Mejía-Ospino, E, Rodríguez-Pereira, J
Format: Article
Language:English
Subjects:
Aging (natural)
Apatite
Biomedical materials
Calcium phosphates
Dip coatings
Emission analysis
Field emission microscopy
Hydroxyapatite
Immersion coating
Microstructure
Photoelectrons
Physics
Raman spectroscopy
Sodium hydroxide
Sol-gel processes
Spectrum analysis
Substrates
Surgical implants
Titanium
Titanium dioxide
X ray photoelectron spectroscopy
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Summary:Bioactive hydroxyapatite (HA) coatings were fabricated by a precipitation, sol-gel and dip-coating method. The effects of the aging time and the base used to adjust pH and substrate materials on the phases and microstructures of HA coatings were studied by field emission scanning electron microscopy FESEM, energy dispersive spectroscopy EDS, X-ray photoelectron spectroscopy XPS, and the vibrations of the phosphate groups were determined by Raman spectroscopy. The results showed that all the films were composed of the phases of TiO2 and HA. With coated titanium substrate with TiO2, the crystallinity of the HA coating increases, the structure became more compact and the Ca/P ratio increased because of the loss of P in the films. The addition of sodium hydroxide (adjusting the pH level to about 10) can increase the HA content in the coating. XPS and EDS results for steel substrate and titanium showed poor calcium content as obtained with a Ca/P ratio of 1.38 and 1.58, respectively, composition is similar to that of natural apatite. However, spectroscopic results suggest the presence of a mixture of hydroxyapatite and octacalcium phosphate. The different substrate materials have a high influence on the microstructure of the separated double films. However, hydroxyapatite nanopowders coatings were obtained using a simple method, with potential biomedical applications.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/786/1/012024