Graded surface structure of bioactive titanium prepared by chemical treatment.
An NaOH treatment of pure titanium (Ti) forms a sodium titanate hydrogel surface layer with a smooth graded interface structure to the Ti metal substrate. Subsequent heat treatment at 600 degrees C of the NaOH-treated Ti forms an amorphous sodium titanate surface layer with a smooth graded interface structure similar to the Ti metal substrate. These treated Ti metals both form an apatite surface layer with a smooth graded interface structure to the Ti metal substrates in simulated body fluid (SBF). The smooth graded interface structures give a tight bond of the apatite layer to the substrates. Heat treatment at 800 degrees C of the NaOH-treated Ti forms crystalline sodium titanate and a rutile surface layer with a graded interface structure to the Ti metal substrate, which is intervened by a thick titanium oxide. This substrate forms an apatite layer with a graded interface structure to the Ti metal substrate, which is intervened by a thick titanium oxide in SBF. This irregular graded structure gives a less tight bond of the apatite layer to the substrate.
Department of Material Chemistry, Kyoto University, Kyoto 606-8501, Japan. Kim@sung7.Kuic.Kyoto-u.ac.jp
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D001031:Apatites / Q000737:chemistry; D001826:Body Fluids / Q000737:chemistry; D002424:Caustics / Q000737:chemistry; D006358:Hot Temperature; 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; D002424:Caustics; D012972:Sodium Hydroxide; D014025:Titanium