Speaker
Description
Due to its chemical similarity to bones and teeth the hydroxyapatite exhibits excellent biocompatibility1 with soft tissues such as skin, muscle and, gums, making it an ideal candidate for orthopedic and dental implants or components of implants, presenting as a high interest biomaterial scientific2-4. Due to its wide application as a biomaterial, it is necessary to develop materials with better properties and more economically viable methods of synthesis.
In this work, nanohydroxyapatite powders were successfully synthesized from hen’s eggshells. The calcium carbonate (eggshell) was converted into CaO which was hydrolyzed to form Ca(OH)2 and then react with phosphoric acid. The reaction was given at room temperature, controlled acid addition rate, pH in the range of 11-12, and in the presence of different amounts of sucrose (1 and 3g). The powders obtained were calcined at 600°C for two hours and the materials obtained were characterized by N2 adsorption at 77k (BET), X-Ray Diffraction (XRD) and, Transmission Electron Microscopy (TEM).
The XRD results through refinement by the Rietveld method indicated that the materials obtained are formed exclusively by the hydroxyapatite phase with monoclinic structure. Through the analysis in MET, it was possible to observe the particle size reduction caused by sucrose, from 50 nm to 10 nm. In addition to effects on particle size, sucrose provided some changes in the material's morphology, which previously consisted exclusively of rods like, became spheroidal particles and, a rise specific surface, from 36 to 93 m2/g.
Sucrose proved to be an excellent material to act in the modification of the properties of hydroxyapatite, with reduction of the particle size and increase of the specific surface, besides being a cheap and abundant material.
Keyword: hydroxyapatite; nanomaterial; sucrose; biowaste.
| Speaker Country | Brazil |
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