One of the most important feature of material, which can replace or join bone, is bioactivity which consist in the formation of the bonelike apatite layer on its surface in body environment, or also in simulated body fluid (SBF). It is known that some sol-gel coatings like Si-, Nb-, Zr-, Ti- oxides show this property, but the nature of this effect is not quite clear yet.
TiO₂ sol-gel coatings were obtained by a dip-coating process using titanium(IV)butoxide as a sol precursor. The influence of heat treatment temperature of sol-gel TiO₂ coatings on their bioactivity was investigated.
The bioactivity of TiO₂ coatings was determinated as ability to form a layer of hydroxyapatite on their surfaces by soaking in SBF. The surface morphology and chemical composition of the surfaces of TiO₂ coatings were studied by scanning electron microscopy (SEM) and energy disperse X-ray microanalysis (EDX), respectively. The bioactivity of TiO₂ coatings was correlated with their bond configuration which were characterised by FTIR.

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