Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/22209
Título: | Characterization of intermediate stages in the precipitation of hydroxyapatite at 37°C |
Autor(es): | Castro, Filipa Ferreira, António Rocha, F. A. Vicente, A. A. Teixeira, J. A. |
Palavras-chave: | Precipitation Batch Calcium phosphate Supersaturation Morphology Aggregation |
Data: | 2012 |
Editora: | Pergamon Press |
Revista: | Chemical Engineering Science |
Resumo(s): | Precipitation of hydroxyapatite Ca 5(PO 4) 3OH (HAp) was carried out by mixing a saturated calcium hydroxide aqueous solution with an orthophosphoric acid aqueous solution at 37°C. In order to promote optimal conditions for the production of HAp with high yields, mixing of the reaction medium was assured by a novel metal stirrer. Different experimental conditions were studied varying the mixing Ca/P molar ratio from 1 to 1.67. After process optimization, a suspension of HAp particles with pH close to 7 was obtained for a mixing molar ratio Ca/P=1.33. The precipitation process was then characterized as a function of pH and calcium concentration, revealing the existence of three different stages. The precipitate formed in each stage was characterized by scanning electron microscopy and X-ray diffraction. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/22209 |
DOI: | 10.1016/j.ces.2012.01.058 |
ISSN: | 0009-2509 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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1-s2.0-S0009250912000796-main.pdf | 1,1 MB | Adobe PDF | Ver/Abrir |