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Synthesis and optimization of the production of millimeter-sized hydroxyapatite single crystals by Cl-OH ion exchange


Reference:

García-Tuñon, E., Franco, J., Eslava, S., Bhakhri, V., Saiz, E., Giuliani, F. and Guitián, F., 2013. Synthesis and optimization of the production of millimeter-sized hydroxyapatite single crystals by Cl-OH ion exchange. Journal of the American Ceramic Society, 96 (3), pp. 759-765.

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http://dx.doi.org/10.1111/jace.12199

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Abstract

Millimeter-sized hydroxyapatite (HA) single crystals were synthesized from chlorapatite (ClAp) crystals via the ionic exchange of Cl for OH at high temperature. X-ray diffraction, Fourier-transform infrared spectroscopy, and chloride content measurements were used to follow the progress of this conversion, and to assess the effect of the experimental conditions (temperature, time, and atmosphere). Cl→OH exchange took place homogeneously and was enhanced by firing in wet air. After firing at 1425°C for 2 h 92% of the Cl ions were exchanged by OH while maintaining crystal integrity. Temperatures above 1450°C damaged the surface of the crystals, destroying the hexagonal habit at 1500°C. The composition of these apatite crystals was close to bone mineral content. Their nanoindentation hardness (8.7 ± 1.0 GPa) and elastic nanoindentation modulus (120 ± 10 GPa) were similar to those of the starting ClAp (6.6 ± 1.5 GPa, and 110 ± 15 GPa, respectively). However, their average flexural strength was ~25% lower due to the formation of defects during the thermal treatments.

Details

Item Type Articles
CreatorsGarcía-Tuñon, E., Franco, J., Eslava, S., Bhakhri, V., Saiz, E., Giuliani, F. and Guitián, F.
DOI10.1111/jace.12199
Related URLs
URLURL Type
http://www.scopus.com/inward/record.url?scp=84875264758&partnerID=8YFLogxKUNSPECIFIED
DepartmentsFaculty of Engineering & Design > Chemical Engineering
RefereedYes
StatusPublished
ID Code41022

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