title: Effect of HCl concentrations on apatite-forming ability of NaOH-HCl- and heat-treated titanium metal.
abstract: Titanium (Ti) metal was treated with water or HCl solutions after 5 M NaOH solution treatment and then subjected to heat treatment at 600 degrees C. The apatite-forming abilities of the treated Ti metals were examined in simulated body fluid. The apatite-forming ability of the Ti metal subjected to NaOH, water and heat treatment was lower than that of just NaOH and heat treatments. Ti metals subjected to NaOH, HCl and heat treatment showed apatite-forming abilities, which increased with increasing HCl concentrations up to the same level as that of NaOH- and heat-treated Ti metal. The former did not show a decrease in its apatite-forming ability, even in a humid environment for a long period, whereas the latter decreased its ability. The increase in the apatite-forming ability with increasing HCl concentrations suggests a different mechanism of apatite formation from that previously proposed.
authors: Department of Biomedical Sciences, College of Life and Health Sciences, Chubu University, Kasugai, Aichi, Japan. deepak@isc.chubu.ac.jp
authors: Deepak K
authors: DK
authors: Pattanayak
authors: Takahiro
authors: T
authors: Kawai
authors: Tomiharu
authors: T
authors: Matsushita
authors: Hiroaki
authors: H
authors: Takadama
authors: Takashi
authors: T
authors: Nakamura
authors: Tadashi
authors: T
authors: Kokubo
mesh_terms: D001031:Apatites / Q000737:chemistry*; D006358:Hot Temperature; D006851:Hydrochloric Acid / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D012972:Sodium Hydroxide / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D001031:Apatites; D012972:Sodium Hydroxide; D014025:Titanium; D006851:Hydrochloric Acid