title: Apatite growth on calcium adsorbed surface of wet flocculated silica particles immersed in a modified simulated body fluid.
abstract: An alternative method for the calcium phosphate apatite formation onto the surface of flocculated pure silica particles is reported, in an attempt to understand the possible mechanism for the apatite formation. A stable silica sol was flocculated by adding calcium ions in aqueous solution. The wet flocks were resuspended in a basic aqueous solution containing a calcium salt, trying to allow the absorption of calcium ions onto the silica surface through a hydrogen ion exchange. The as-prepared materials were immersed in a modified simulated body fluid at different temperatures (37 and 90 degrees C) and silica concentrations. It was found that these factors have a strong influence on the apatite formation. The apatite formation was confirmed by (31)P MAS-NMR, FT-Raman, XRD, and TEM.
authors.affiliation: Departamento de Física, UAM-Iztapalapa, Apdo. Postal 55-534, M¿exico, D.F. 09340.
authors.forename: J
authors.initials: J
authors.lastname: Coreño
authors.forename: E
authors.initials: E
authors.lastname: Rivera
authors.forename: V
authors.initials: V
authors.lastname: Castaño
authors.forename: R
authors.initials: R
authors.lastname: Rodríguez
mesh_terms: D000327:Adsorption; D001031:Apatites; D001672:Biocompatible Materials; D001826:Body Fluids; D002118:Calcium; D005427:Flocculation; D066298:In Vitro Techniques; D009682:Magnetic Resonance Spectroscopy; D008422:Materials Testing; D008854:Microscopy, Electron; D008954:Models, Biological; D012822:Silicon Dioxide; D013059:Spectrum Analysis, Raman; D013499:Surface Properties; D014961:X-Ray Diffraction
chemical_list: D001031:Apatites; D001672:Biocompatible Materials; D012822:Silicon Dioxide; D002118:Calcium