The nano crystalline biphasic calcium phosphates of hydroxyapatite (HAp)/β-tricalcium phosphate (β-TCp) in the ratio
80:20 and 72:28 with interconnected porosity have successfully been prepared by co-precipitation method using mixed
catanionic surfactants as template. The sample was calcinated at various temperatures for 8 h. The samples were
characterized using X-ray diffraction, Fourier transform infrared spectroscopy, Field emission scanning electron
microscopy (FESEM) and thermal analyser. The samples calcinated at 750°C and 850°C show 75% and 89% of
crystallinity respectively. Usually to obtain the biphasic calcium phosphates, either the medium will be set as acidic by
altering the pH or the Ca/P ratio can be set below the value of 1.5. However this experiment was neither conducted with
low Ca/P ratio (≤1.5) nor at low pH (≤7) to obtain the mixed phase. The combination of surfactants and calcination
temperature controls the HAp/β-TCp ratio.
The nano crystalline hydroxyapatite with highly uniform spherical morphology has successfully been prepared
using the new cationic surfactant Cetrimide as template by co-precipitation method at ambient temperature. The sample
was calcinated at 750 °C for 8h. The FTIR spectrum shows the chemical composition of HAP. The XRD pattern
confirms the characteristic peaks and the hexagonal structure of HAP. The lattice parameters calculated from the XRD
pattern are a = b ~ 0.93873 nm, c = 0.68486 nm, the axial ratio ~0.7296, the volume of the unit cell ~522.6535x10-30
m3. The size and morphology of the sample were analyzed by FESEM, which shows that the spherical HAp particles
with diameter 150-200 nm have successfully been synthesized. All the inspections confirm the successful preparation
of nano spherical HAP with excellent morphology control, and uniform size.
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