Formation of Amorphous TiO2 Film on Ti Using Anodizing in Concentrated H3PO4 Aqueous Solution and Its Osteoconductivity

Yamamoto Dai, Iida Takanori, Kuroda Kensuke, Ichino Ryoichi, Okido Masazumi, Seki Azusa

doi:10.2320/jinstmet.77.33

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高濃度リン酸水溶液中陽極酸化によるチタン表面へのアナターゼライクアモルファス皮膜の作製とその骨伝導性
Formation of Amorphous TiO₂ Film on Ti Using Anodizing in Concentrated H₃PO₄ Aqueous Solution and Its Osteoconductivity

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Anodizing of Ti specimens were performed in concentrated H₃PO₄ aqueous solutions with a purpose to incorporate a large amount of phosphate ion into anodized coatings, and their osteoconductivity was evaluated in in vivo test. Ti specimens were anodized in 0.1–11 M H₃PO₄ aqueous solutions up to 200 V at a rate of 0.1 V s⁻¹. Anodized coatings were evaluated with SEM, TEM, XRD, XPS, and laser microscope. Anodized specimens were implanted in rats’ tibia for 14 d, and then extracted. When anodized in concentrated (≥2 M) H₃PO₄ aqueous solutions under spark discharge, crystallized anatase transformed to amorphous anatase by containing a large amount of PO₄³⁻ in crystal lattice of TiO₂. The amorphous anatase coatings had better osteoconductivity than the crystallized anatase coatings. It is not exactly clear what was the intrinsic factor for the high osteoconductivity, but the crystallinity of anatase and/or PO₄³⁻ in the film is considered to be responsible for the difference in bone-forming ability of TiO₂ films.

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MATERIALS TRANSACTIONS

MATERIALS TRANSACTIONS 53 (3), 508-512, 2012

The Japan Institute of Metals and Materials

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Formation of Amorphous TiO<sub>2</sub> Film on Ti Using Anodizing in Concentrated H<sub>3</sub>PO<sub>4</sub> Aqueous Solution and Its Osteoconductivity