title: Bioactive surface modification of Ti-29Nb-13Ta-4.6Zr alloy through alkali solution treatments.
abstract: Bioactive surface modification of Ti-29Nb-13Ta-4.6Zr alloy (TNTZ) was performed through three different alkali solution treatments, including the electrochemical (E), hydrothermal (H), and hydrothermal-electrochemical (HE) processes; all of the processes lead to the formation of sodium-contained amorphous titanium oxide layers on TNTZ samples. The TNTZ samples subjected to the E, H, and HE processes exhibit a flat surface, smooth and fine mesh-like structure surface, and rough mesh-like structure surface, respectively. In the bioactive test, namely, simulated body fluid test, apatite inductivity increases as the surface morphology becomes rough. The order of inductivity for the three processes was HE>H>E. The surface chemical composition also affects the apatite induction ability. The surface with fewer niobium species exhibits better apatite inductivity.
authors.affiliation: Department of Electrochemistry, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Takematsu
authors.affiliation: Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Katsumata
authors.affiliation: Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8550, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Okada
authors.affiliation: Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 985-8577, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Niinomi
authors.affiliation: Department of Electrochemistry, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan; Department of Chemistry and Materials Science, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8550, Japan. Electronic address: matsushita.n.ab@m.titech.ac.jp.
authors.forename: N
authors.initials: N
authors.lastname: Matsushita
mesh_terms: D001031:Apatites / Q000737:chemistry; D001672:Biocompatible Materials / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D009556:Niobium / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D013059:Spectrum Analysis, Raman; D013499:Surface Properties; D013635:Tantalum / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction; D015040:Zirconium / Q000737:chemistry*
chemical_list: D001031:Apatites; D001672:Biocompatible Materials; C481486:Ti-29Nb-13Ta-4.6Zr alloy; D009556:Niobium; D013635:Tantalum; D015040:Zirconium; D014025:Titanium
keywords: Anodization; Apatite; Bioactive surface modification; Hydrothermal; Hydrothermal-electrochemical process; Ti–29Nb–13Ta–4.6Zr alloy