Effect of phosphorus precursors on the structure of bioactive calcium phosphate silicate systems.
The main aim of this work was to synthesize calcium phosphate silicate bioceramics by a low energy-consuming sol-gel method applying various phosphorous precursors (triethyl phosphate, phosphoric acid, and ammonium hydrogen phosphate). The investigations concentrated on the influence of phosphorous initial compounds on the bond and crystalline structures and the material quality. The application of the alkoxide and inorganic P-precursors results in considerably different textures. The inorganic PO4-containing precursors lead to sol formations. The sol systems can be characterized by a randomly bonded aggregate structure. Monolith gel systems can only be prepared by using TEP. The alkoxide P-precursor more effectively furthers the connection between the phosphorous and silicon tetrahedra than the inorganic phosphate compounds. Over the P-precursors, the catalyst also affects the structure and properties. In the present work, a special attention was paid to identify the POSi bonds in the FTIR and31P NMR spectra. The bond systems were investigated by FTIR,31P and29Si MAS NMR spectroscopies, the morphology by SEM, WAXS, and XRD measurements, and the water solubility of the ceramic systems also was tested.
Institute of Chemistry, L. Eötvös University, Budapest H-1117, Hungary. Electronic address: sinko@chem.elte.hu.
Katalin
K
Sinkó
Institute of Chemistry, L. Eötvös University, Budapest H-1117, Hungary.
Anikó
A
Meiszterics
Institute of Chemistry, L. Eötvös University, Budapest H-1117, Hungary.
János
J
Rohonczy
Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Japan.
Balázs
B
Kobzi
Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Japan.
Shiro
S
Kubuki
D001672:Biocompatible Materials / Q000737:chemistry*; D002130:Calcium Phosphates / Q000737:chemistry*; D003460:Crystallization; D009682:Magnetic Resonance Spectroscopy; D010758:Phosphorus / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013997:Time Factors; D014732:Vibration; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
D001672:Biocompatible Materials; D002130:Calcium Phosphates; D017640:Silicates; D014867:Water; D010758:Phosphorus; C020243:calcium phosphate
Bioceramics; Calcium phosphate silicate; Phosphorous precursors; Sol-gel process; Structure