The Synthesis Of Nanosized Hydroxyapatite Powders
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Date
2007-04
Authors
Tan, Su Anne
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Nanometer sized hydroxyapatite particles are synthesized via wet chemical
precipitation and characterized. This research studies how key parameters such
as the pH of synthesis, and also the reaction, aging and calcination
temperatures affect the size and phase purity of the hydroxyapatite produced.
The main aim is to determine the optimum condition for producing phase-pure,
nano-sized hydroxyapatite with minimum agglomeration, to be used as bone
replacement material.
A 0.2 M solution of Ca(N03)2.4H20 (Calcium Nitrate Tetrahydrate) and a 0.12
M solution of (NH4)2HP04 (Diammonium Hydrogen Phosphate) are coprecipitated
in the presence of a dispersant. P207 (Tetrapotassium
Pyrophosphate Tetrabasic), under various temperatures, pH and continuous
stirring. This is followed by aging at various temperatures and durations, and
after that drying, and finally calcination at various temperatures ranging from
700 to 1000°C. Characterization was carried out using X-ray powder diffraction
and X-ray fluoroscopy for phase identification while particle sizing was done via
Scanning Electron Microscopy (SEM), the BET method, and also a particle
sizer.
Description
Keywords
Mining engineering