Preparation of hydroxyapatite via microemulsion route.
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).
Koumoulidis
George C
GC
Department of Chemistry, University of Ioannina, P.O. Box 1186, Ioannina 451 10, Greece.
Katsoulidis
Alexandros P
AP
Ladavos
Athanasios K
AK
Pomonis
Phillippos J
PJ
Trapalis
Christos C
CC
Sdoukos
Antonios T
AT
Vaimakis
Tiberius C
TC
D003460:Crystallization; D017886:Durapatite / Q000138:chemical synthesis*; D004655:Emulsions / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D049329:Nanostructures / Q000737:chemistry*; D016062:Porosity; D013696:Temperature
D004655:Emulsions; D017886:Durapatite