The calcium phosphate nanoparticles were characterized
by TEM (Philips, CM 12), on conventional carbon-coated
copper grids (400 meshes, Plano GmbH, Germany), and it
was cleaned using plasma treatment under oxygen for 45 s.
A 5 ll of the sample was then placed on the grid and then
dried at room temperature for 1 h. The samples were
inspected by operating at 120 kV.