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Protein―hydroxyapatite Composite Coatings on TiO2 Nanotube Layers and Bond Strength to Substrate

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Author(s): YU Rong, FENG Bo, WANG Jian-Xin, LU Xiong, QU Shu-Xin,WENG Jie

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 9;
Start page: 987;
Date: 2011;
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Keywords: TiO2 nanotubes; bovine serum albumin; apatite coating; bonding strength

ABSTRACT
TiO2 nanotubes on titanium with different diameters were prepared by anodic oxidation after heat―treated at 450¡æ. Hydroxyapatite (HA) coatings containing bovine serum albumin (BSA) were produced on the nanostructured surface through biomimetic co―deposition. The TiO2 nanotube layers with 170nm diameter has a better mineralization ability compared that with diameter of 100nm and 50nm, And the HA formation ability is enhanced with increase of the diameters. The bonding strength of the coating to the nanotube layers with large diameter is higher than that with small diameter, and the maximal strength can reach 16.95MPa. Moreover, the pre―mineralization in vacuum significantly enhances the bonding strength, and increases growth rate of the coating. The BSA―HA coating with high bonding strength can fastly form on TiO2 nanotube layers by pre―mineralization in vacuum and then biomimetic co―deposition, which would be a promised method for preparing titanium―based bioacitive coatings.
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