Hidroxiapatita obtida por reação de combustão sinterizada por plasma
Calcium phosphate bioceramics are a group of highly attractive materials for biomedical applications. Some of these bioceramics have special attention, including: hydroxyapatite (Hap) Hap [Ca10(PO4)6(OH)2], which has a structure and composition similar to the mineral phase of human bone (apatite) an...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/48350 |
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| Resumo: | Calcium phosphate bioceramics are a group of highly attractive materials for biomedical applications. Some of these bioceramics have special attention, including: hydroxyapatite (Hap) Hap [Ca10(PO4)6(OH)2], which has a structure and composition similar to the mineral phase of human bone (apatite) and therefore has excellent biocompatibility, high osteoinduction enabling bone regeneration, which presents high bioadsorption in vivo, these materials are commonly used in the form of porous grains and a synthesized or porous block in different areas of the health sciences, such as dentistry and orthopedics. for the synthesis of the ceramic material it intensively influences the structure of the material obtained and in the case of Hap it must be formed by nanometric grains so that its structure is as similar as possible to biological apatite. In this research, the combustion reaction was used for the obtaining of nanostructured hydroxyapatite Hap [Ca10(PO4)6(OH)2], using glycine and urea as fuel, as it is a fast and low cost procedure. By analyzing the results, it was found that it was possible to produce nanometric samples by combustion reaction, after being sintered by plasma at 800 ° C and 1000 ° C, biphasic samples were presented, with the presence of Hap and calcium phosphate, with o Mev in samples before sintering present fibrous agglomerates for glycine and aciculate shape for urea, after sintering they presented acicular grains of namometric size 127nm for glycine at 1000 ° C and 172.26 nm .For samples analyzed by FTIR glycine and urea we can see that all the absorption bands remained, regardless of the temperature, the absorption bands were preserved because no bond was broken due to the temperature increase being stable at the sintering temperature of 800 ° C and 1000 ° C. The X-ray diffraction visualized the presence of Hap before and put the sintering by plasma, presenting the primary phase as Hap and secondary calcium phosphate and the plasma promoted the allotropic transformation of B-TCP in PAH. Thermogravimetric analysis shows that the sample has predominantly two thermal events, the first between 18 ° C and 110 ° C and the second between 435 ° C and 541 ° C for urea for Glycine. first 27.77 ° C and 128.74 ° C and the second between 170 and 225.9C and lastly between 868 ° C and 971 ° C and a set of repetitive events of 582 ° C 821 ° C. The Hap produced has a nanometric structure with the potential to be used as material for scaffold production . |
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