Contrasting Morphology of Calcium Phosphate Powders Prepared by the Wet Method Using Poly (Ethylene Glycol) |
| Journal |
Materials Science Forum (Volumes 587 - 588) |
| Volume |
Advanced Materials Forum IV |
| Edited by |
António Torres Marques, António Fernando Silva, António Paulo Monteiro Baptista, Carlos Sá, Fernando Jorge Lino Alves, Luís Filipe Malheiros and Manuel Vieira |
| Pages |
32-36 |
| DOI |
10.4028/www.scientific.net/MSF.587-588.32 |
| Online since |
June, 2008 |
| Authors |
Susana Dias,
Vera Lourenço,
Carlos A. Nogueira,
Fernando A. Costa Oliveira
|
| Keywords |
Biomaterial, Chemical Precipitation, Synthesis, Tricalcium Phosphate |
| Abstract |
When preparing β-tricalcium phosphate (β-TCP), it is difficult to industrialise traditional
methods because of the problem of particle aggregation. In this paper, β-TCP was prepared by
calcining calcium-deficient hydroxyapatite (CDHA) powders obtained by the wet precipitation
method at pH=6 and 40 ºC, together with additions of poly (ethylene glycol) (PEG), in order to
prevent powder agglomeration. The effect of the Ca/PEG mass ratio on the particle size distribution
and the morphology of the resulting powders was evaluated. For comparison purposes, one powder
without PEG addition was also synthesized. All synthesized powders were characterized by means
of X-ray diffraction analysis, particle size analysis and scanning electron microscopy prior and after
calcination in static air at 1000 ºC for 15 h. Single-phase β-TCP powders have been obtained by
calcining CDHA powders in the temperature range of 850ºC-1150ºC. It was also found that
increasing the PEG content in solution decreased the particle size distribution of the agglomerated
particles and the β→α-TCP transition temperature. A plausible explanation consistent with these
experimental findings is proposed. |
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