Effect of ammonia or nitric acid treatment on surface structure, in vitro apatite formation, and visible-light photocatalytic activity of bioactive titanium metal

Masakazu Kawashita; Naoko Matsui; Toshiki Miyazaki; Hiroyasu Kanetaka

doi:10.1016/j.colsurfb.2013.06.049

Effect of ammonia or nitric acid treatment on surface structure, in vitro apatite formation, and visible-light photocatalytic activity of bioactive titanium metal

Colloids Surf B Biointerfaces. 2013 Nov 1:111:503-8. doi: 10.1016/j.colsurfb.2013.06.049. Epub 2013 Jul 9.

Authors

Masakazu Kawashita¹, Naoko Matsui², Toshiki Miyazaki³, Hiroyasu Kanetaka⁴

Affiliations

¹ Graduate School of Biomedical Engineering, Tohoku University, Sendai 980-8579, Japan. Electronic address: m-kawa@ecei.tohoku.ac.jp.
² Graduate School of Biomedical Engineering, Tohoku University, Sendai 980-8579, Japan.
³ Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu 808-0196, Japan.
⁴ Liaison Center for Innovative Dentistry, Graduate School of Dentistry, Tohoku University, Sendai 980-8575, Japan.

PMID: 23886785
DOI: 10.1016/j.colsurfb.2013.06.049

Abstract

Ti metal treated with NaOH, NH4OH, and heat and then soaked in simulated body fluid (SBF) showed in vitro apatite formation whereas that treated with NaOH, HNO3, and heat and then soaked in SBF did not. The anatase TiO2 precipitate and/or the fine network structure formed on the surface of the Ti metal treated with NaOH, NH4OH, and heat and then soaked in SBF might be responsible for the formation of apatite on the surface of the metal. The NaOH, NH4OH, and heat treatments might produce nitrogen-doped TiO2 on the surface of the Ti metal, and the concentration of methylene blue (MB) in the Ti metal sample treated with NaOH, NH4OH, and heat decreased more than in the untreated and NaOH- and heat-treated ones. This preliminary result suggests that Ti metal treated with NaOH, NH4OH, and heat has the potential to show photocatalytic activity under visible light.

Keywords: Apatite; Nitrogen; Simulated body fluid; Titania; Titanium metal; Visible-light photocatalytic activity.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Ammonia / pharmacology*
Apatites / chemistry*
Biocompatible Materials / pharmacology*
Catalysis / radiation effects
Light*
Methylene Blue / chemistry
Microscopy, Electron, Scanning
Nitric Acid / pharmacology*
Photoelectron Spectroscopy
Surface Properties
Titanium / pharmacology*
X-Ray Diffraction

Substances

Apatites
Biocompatible Materials
Nitric Acid
Ammonia
Titanium
Methylene Blue