title: Electrophoretic deposition of zinc-substituted hydroxyapatite coatings.
abstract: Zinc-substituted hydroxyapatite nanoparticles synthesized by the co-precipitation method were used to coat stainless steel plates by electrophoretic deposition in n-butanol with triethanolamine as a dispersant. The effect of zinc concentration in the synthesis on the morphology and microstructure of coatings was investigated. It is found that the deposition current densities significantly increase with the increasing zinc concentration. The zinc-substituted hydroxyapatite coatings were analyzed by X-ray diffraction, scanning electron microscopy and Fourier transform infrared spectroscopy. It is inferred that hydroxyapatite and triethanolamine predominate in the chemical composition of coatings. With the increasing Zn/Ca ratios, the contents of triethanolamine decrease in the final products. The triethanolamine can be burnt out by heat treatment. The tests of adhesive strength have confirmed good adhesion between the coatings and substrates. The formation of new apatite layer on the coatings has been observed after 7days of immersion in a simulated body fluid. In summary, the results show that dense, uniform zinc-substituted hydroxyapatite coatings are obtained by electrophoretic deposition when the Zn/Ca ratio reaches 5%.
authors.affiliation: Advanced Biomaterials and Tissue Engineering Center, Huazhong University of Science and Technology, Wuhan 430074, PR China.
authors.forename: Guangfei
authors.initials: G
authors.lastname: Sun
authors.affiliation: Advanced Biomaterials and Tissue Engineering Center, Huazhong University of Science and Technology, Wuhan 430074, PR China; Department of Biomedical Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China. Electronic address: caltary@gmail.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Ma
authors.affiliation: Advanced Biomaterials and Tissue Engineering Center, Huazhong University of Science and Technology, Wuhan 430074, PR China; Department of Biomedical Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
authors.forename: Shengmin
authors.initials: S
authors.lastname: Zhang
mesh_terms: D020001:1-Butanol / Q000737:chemistry; D002118:Calcium / Q000737:chemistry; D017886:Durapatite / Q000138:chemical synthesis*; D004586:Electrophoresis; D004983:Ethanolamines / Q000737:chemistry; D006358:Hot Temperature; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D017550:Spectroscopy, Fourier Transform Infrared; D013193:Stainless Steel / Q000737:chemistry; D013499:Surface Properties; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry*
chemical_list: D004983:Ethanolamines; D013193:Stainless Steel; D020001:1-Butanol; D017886:Durapatite; C009546:triethanolamine; D015032:Zinc; D002118:Calcium
keywords: Coatings; Electrophoretic deposition; Hydroxyapatite; Triethanolamine; Zinc substitution; n-Butanol