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Preparation of magnesium-substituted hydroxyapatite powders by the mechanochemical–hydrothermal method

Paper ID Volume ID Publish Year Pages File Format Full-Text
13392 853 2004 11 PDF Available
Title
Preparation of magnesium-substituted hydroxyapatite powders by the mechanochemical–hydrothermal method
Abstract

Magnesium-substituted hydroxyapatite (Mg-HAp) powders with different crystallinity levels were prepared at room temperature via a heterogeneous reaction between Mg(OH)2/Ca(OH)2 powders and an (NH4)2HPO4 solution using the mechanochemical–hydrothermal route. The as-prepared products contained unreacted Mg(OH)2 and therefore had to undergo purification in ammonium citrate aqueous solutions at room temperature. X-ray diffraction, infrared spectroscopy, thermogravimetric and chemical analyses were performed and it was determined that the purified powders were phase-pure Mg-HAp containing 0.24–28.4 wt% of Mg. The concentration of Mg was slightly lower near the surface than in the bulk of the HAp crystals as indicated by X-ray photoelectron spectroscopy. Dynamic light scattering revealed that the median particle size of the room temperature Mg-HAp powders was in the range of 102 nm–1.2 μm with a specific surface area between 91 and 269 m2/g. Scanning electron microscopy confirmed that the Mg-HAp powders consisted of submicron agglomerates of nanosized crystals, less than ≈20 nm.

Keywords
Hydroxyapatite; Magnesium; Nanoparticle; Crystallinity; Hydrothermal synthesis; Mechanochemical synthesis
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Preparation of magnesium-substituted hydroxyapatite powders by the mechanochemical–hydrothermal method
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 25, Issue 19, August 2004, Pages 4647–4657
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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