pH impact on the sol-gel preparation of calcium hydroxyapatite, Ca10(PO4)6(OH)2, using a novel complexing agent, DCTA |
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Authors: | Irma Bogdanoviciene Kaia T?nsuaadu Valdek Mikli Inga Grigoraviciute-Puroniene Aldona Beganskiene and Aivaras Kareiva |
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Institution: | (1) Department of General and Inorganic Chemistry, Vilnius University, LT-03225 Vilnius, Lithuania;(2) Department of Computer Science, Vilnius University, LT-03225 Vilnius, Lithuania; |
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Abstract: | Aqueous sol-gel chemistry routes — based on ammonium hydrogen phosphate as the phosphorus precursor, calcium acetate monohydrate
as the source of calcium ions, and 1,2-diaminocyclohexanetetraacetic acid monohydrate (DCTA) as the complexing agent — have
been used to prepare calcium hydroxyapatite (HA). The sol-gel process was performed in aqueous solution at different pH values
followed by calcination of the dry precursor gels for 5 h at 1000°C. Phase transformations, composition, and structural changes
in the polycrystalline samples were studied by thermoanalytical methods (TG/DTA), infrared spectroscopy (IR), X-ray powder
diffraction analysis (XRD), and scanning electron microscopy (SEM). It was shown that pH adjustment has significant impact
on the apatite formation process and on the morphology and phase purity of the ceramic samples. |
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