Mehrdad Keshmiri

Apatite formation on TiO2 anatase microspheres

Abstract Titanium dioxide (TiO 2 ) coatings have been long considered as biocompatible interfaces to promote the physico-chemical bonding between the bone tissues and implant material (e.g., titanium and stainless steel). Monodispersed TiO 2 (anatase, the low temperature polymorph of TiO 2 ) microspheres, produced in the form of colloidal precipitates, were deposited on different substrates and apatite formation was induced on the resulted surface by immersing the coated substrates in simulated body fluid solution. Analytical and microstructural investigations, conducted by X-ray diffraction, energy depressive X-ray spectroscopy and scanning electron microscopy techniques, showed considerable higher rates of apatite formation, in vitro, on the anatase microspheres compared to the sol–gel-derived thin films of the same oxide. We concluded that the particular surface morphology of the packed TiO 2 microspheres, promotes a faster apatite formation in vitro.

Synthesis of narrow size distribution sub-micron TiO2 spheres

Abstract Ultra-fine spheres of TiO2 are synthesized through sol–gel colloidal processing. Compared to previous studies, the present work shows a considerable achievement in controlling the shape of the produced particles as well as a relatively narrow size distribution.