Characterization of intermediate stages in the precipitation of hydroxyapatite at 37 degrees C

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Filipa Castro (Autor) FEUP; António Ferreira (Autor) FEUP; Fernando Rocha (Autor) FEUP; António Vicente (Autor) Outra; José António Teixeira (Autor) Outra

Revista

Título: Chemical Engineering Science

Vol. 77

Páginas: 150-156

ISSN: 0009-2509

Editora: Elsevier

Indexação

ISI Web of Knowledge - 30 Citações

Scopus - 29 Citações

INSPEC

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

Projetos Associados

PEst-C/EQB/UI0511/2011 - PROJECTO ESTRATÉGICO - UI 511 - 2011-2012

Outras Informações

ID Authenticus: P-002-7VW

DOI: 10.1016/j.ces.2012.01.058

Abstract (EN): Precipitation of hydroxyapatite Ca-5(PO4)(3)OH (HAp) was carried out by mixing a saturated calcium hydroxide aqueous solution with an orthophosphoric acid aqueous solution at 37 degrees 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7