Control of HAp Formation and Osteoconductivity on Nitrogen-Doped TiO2 Scale Formed by Oxynitridation of Ti

Masami Hashimoto; Satoshi Kitaoka; Yoshihiro Obata; Shunsuke Muto; Takafumi Ogawa; Maiko Furuya; Hiroyasu Kanetaka

doi:10.4028/www.scientific.net/KEM.758.86

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 758Control of HAp Formation and Osteoconductivity on...

Control of HAp Formation and Osteoconductivity on Nitrogen-Doped TiO₂ Scale Formed by Oxynitridation of Ti

Abstract:

The surface potential of the TiO₂ scale formed on Ti was controlled by varying the Ti heat treatment conditions in a N₂ atmosphere containing a trace amount of O₂. The surface potential was attributed to the effective charge of nitrogen-related defects in the TiO₂, where the positive and negative surface charges were associated with (N₂)₀+2 and (NO)₀^-1, respectively. The latter defects were formed only during the early stages of the heat treatment, and with increasing treatment time, this was followed by the formation of voids containing N₂ in the scale rather than the disappearance of the defects in the TiO₂ crystal lattice, resulting in zero surface charge. Hydroxyapatite (HAp) formation and osteoconductivity were enhanced on nitrogen-doped TiO₂ scale with either a positive or negative surface potential. In contrast, for the unchanged TiO₂ scale, no HAp formation was observed and the osteoconductivity was low.

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Periodical:

Key Engineering Materials (Volume 758)

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86-89

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.758.86

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Online since:

November 2017

Authors:

Masami Hashimoto*, Satoshi Kitaoka, Yoshihiro Obata, Shunsuke Muto, Takafumi Ogawa, Maiko Furuya, Hiroyasu Kanetaka

Keywords:

Hydroxyapatite, Nitrogen-Related Defect, Osteoconductivity, Surface Potential, TiO₂

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