Notice of RetractionTiO2 Anatase Coatings on Porous NiTi Shape Memory Alloy Prepared by a Dipping Sol-Gel Method

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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A dense TiO₂ coating has been dip-coated on porous NiTi alloys via the sol-gel route using tetrabutyl titanate (Ti(OC₄H₉)₄) as precursor. The sol-gel derived TiO₂ coatings with a controllable thickness covered not only the outer surface but also the inner surface of the porous NiTi alloy without blocking the pores. The immersion test in a simulated body fluid shows that the rates of Ni ion release from the TiO₂ coated porous NiTi alloys of different porosity ratios decrease obviously compared with the uncoated one. There is also a remarkable increase in the apatite forming ability of the TiO₂ coated porous NiTi alloy in a fast calcification solution.