Effect of HCl concentrations on apatite-forming ability of NaOH-HCl- and heat-treated titanium metal.
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.
Pattanayak
Deepak K
DK
Department of Biomedical Sciences, College of Life and Health Sciences, Chubu University, Kasugai, Aichi, Japan. deepak@isc.chubu.ac.jp
Kawai
Takahiro
T
Matsushita
Tomiharu
T
Takadama
Hiroaki
H
Nakamura
Takashi
T
Kokubo
Tadashi
T
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
D001031:Apatites; D012972:Sodium Hydroxide; D014025:Titanium; D006851:Hydrochloric Acid