Apatite growth on calcium adsorbed surface of wet flocculated silica particles immersed in a modified simulated body fluid.
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.
Coreño
J
J
Departamento de Física, UAM-Iztapalapa, Apdo. Postal 55-534, M¿exico, D.F. 09340.
Rivera
E
E
Castaño
V
V
Rodríguez
R
R
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
D001031:Apatites; D001672:Biocompatible Materials; D012822:Silicon Dioxide; D002118:Calcium