Preparation of hydroxyapatite via microemulsion route |
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Authors: | Koumoulidis George C Katsoulidis Alexandros P Ladavos Athanasios K Pomonis Phillippos J Trapalis Christos C Sdoukos Antonios T Vaimakis Tiberius C |
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Affiliation: | Department of Chemistry, University of Ioannina, P.O. Box 1186, Ioannina 451 10, Greece. |
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Abstract: | Hydroxyapatite (HAp) was prepared using a microemulsion route in combination with the pH-shock wave method. The samples as received consisted of amorphous aggregated particles, which had remarkable mesoporosity with a narrow pore size distribution. After being heated at 650 degrees C, the A-type carbonate hydroxyapatite was crystallized at 635 degrees C in particles of similar size (40--120 nm) with no internal porosity. At a higher temperature (900 degrees C) a sintering process took place, resulting in network of a larger particles, consisting of HAp and beta-tricalcium phosphate (beta-TCP). The crystallization of HAp occurs at 635 degrees C with an activation energy of 62.7--72.2 kcalmol(-1). |
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