title: Electrophoretic deposition of silicon substituted hydroxyapatite coatings from n-butanol-chloroform mixture.
abstract: Silicon Substituted Hydroxyapatite (Si-HA) coatings were prepared on titanium substrates by electrophoretic deposition (EPD). The stability of Si-HA suspension in n-butanol and chloroform mixture has been studied by electricity conductivity and sedimentation test. The microstructure, shear strength and bioactivity in vitro has been tested. The stability of Si-HA suspension containing n-butanol and chloroform mixture as medium is better than that of pure n-butanol as medium. The good adhesion of the particles with the substrate and good cohesion between the particles were obtained in n-butanol and chloroform mixture. Adding triethanolamine (TEA) as additive into the suspension is in favor of the formation of uniform and compact Si-HA coatings on the titanium substrates by EPD. The shear strength of the coatings can reach 20.43 MPa after sintering at 700 degrees C for 2 h, when the volume ratio of n-butanol: chloroform is 2:1 and the concentration of TEA is 15 ml/L. Titanium substrates etched in H(2)O(2)/NH(3) solution help to improve the shear strength of the coatings. After immersion in simulated body fluid for 7 days, Si-HA coatings have the ability to induce the bone-like apatite formation.
authors.affiliation: College of Chemistry and Materials Science, Fujian Normal Univeristy, Fuzhou 350007, China.
authors.forename: Xiu Feng
authors.initials: XF
authors.lastname: Xiao
authors.forename: Rong Fang
authors.initials: RF
authors.lastname: Liu
authors.forename: Xiao Lian
authors.initials: XL
authors.lastname: Tang
mesh_terms: D020001:1-Butanol / Q000737:chemistry*; D001826:Body Fluids; D002725:Chloroform / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry*; D004586:Electrophoresis / Q000379:methods*; D004983:Ethanolamines / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D008956:Models, Chemical; D011208:Powders; D011312:Pressure; D012825:Silicon / Q000737:chemistry*; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors; D014961:X-Ray Diffraction
chemical_list: D004983:Ethanolamines; D011208:Powders; D002725:Chloroform; D020001:1-Butanol; D017886:Durapatite; C009546:triethanolamine; D012825:Silicon