title: Synthesized silicon-substituted hydroxyapatite coating on titanium substrate by electrochemical deposition.
abstract: Silicon-substituted hydroxyapaptite (Si-HA) coatings were prepared on titanium substrates by electrolytic deposition technique in electrolytes containing Ca(2+), PO(4)(3-) and SiO(3)(2-) ions with various SiO(3)(2-)/(PO(4)(3-) + SiO(3)(2-)) molar ratios (η(si)). The deposition was all conducted at a constant voltage of 3.0 V, with titanium substrate as cathode and platinum as anode, for 1 h at 85°C. The coatings thus prepared were characterized with inductively coupled plasma (ICP), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), field-emission-type scanning electron microscope (FSEM). The results show that the silicon amount in the coatings increases linearly to about 0.48 wt% at first with increasing η(si) between 0 and 0.03, then increases slowly to about 0.55 wt% between 0.03 and 0.10 and finally maintains almost at a level around 0.55 wt% between 0.10 and 0.30. The tree-like Si-HA crystals are observed in the coatings prepared in the electrolyte of η(si) = 0.20. And the presence of silicon in electrolytes decreases the thickness of the coatings, with effect being more significant as η(si) increased. Additionally, the substitution of Si causes some OH(-) loss and changes the lattice parameters of hydroxyapatite (HA).
authors.affiliation: Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
authors.forename: Deng-Hu
authors.initials: DH
authors.lastname: Li
authors.forename: Jun
authors.initials: J
authors.lastname: Lin
authors.forename: Dong-Yang
authors.initials: DY
authors.lastname: Lin
authors.forename: Xiao-Xiang
authors.initials: XX
authors.lastname: Wang
mesh_terms: D001672:Biocompatible Materials; D017886:Durapatite / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000379:methods*; D008855:Microscopy, Electron, Scanning; D012825:Silicon / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D017886:Durapatite; D014025:Titanium; D012825:Silicon