Hydroxyapatite Nanopowder Synthesis with a Programmed Resorption Rate

Table 1

Effect of the microwave radiation time on the material specific surface area, the density, the grain size calculated on the basis of SSA measurements, and the Ca/P ratio established by the ICP-OES measurements.

Radiation time	SSA	Density	Grain size	Ca/P
(min)	(m^2/g)	(g/cm^3)	(nm)
1.5	236	2.91	9	1.57
2.5	174	2.94	12	1.65
5.0	99	2.96	21	1.66
7.5	81	3.00	25	1.67
10.0	63	3.03	32	1.67