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Mechanochemical synthesis of nanocrystalline carbonate-substituted hydroxyapatite

✍ Scribed by J. Coreño A.; O. Coreño A.; J.J. Cruz R.; C. Rodríguez C.

Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
222 KB
Volume
27
Category
Article
ISSN
0925-3467

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✦ Synopsis

Carbonate-substituted hydroxyapatite has been produced by solid-state reactions using a mechanochemical synthesis method. Ammonium phosphate monobasic and calcium carbonate were used as raw materials. Mixtures of the initial powders were prepared using a Ca/P molar ratio similar to that of non-substituted hydroxyapatite, Ca 10 (PO 4 ) 6 (OH) 2 . Dry milling of the powders was performed by using a ball to powder weight ratio equals 20:1. The obtained product was characterized by means of infrared spectroscopy, transmission electron microscopy and X-ray diffraction. Under the employed synthesis conditions hydroxyapatite is obtained after 2 h of milling. The crystallinity and the amount of the hydroxyapatite increase as milling time does. After milling for 6 h, nanosized apatite which has a possible composition Ca 9+y (CO 3 )(PO 4 ) 5 (OH) 1+2y is obtained.

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