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

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Filipa Castro (Author) FEUP; António Ferreira (Author) FEUP; Fernando Rocha (Author) FEUP; António Vicente (Author) Other; José António Teixeira (Author) Other

Journal

Title: Chemical Engineering Science

Vol. 77

Pages: 150-156

ISSN: 0009-2509

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 30 Citations

Scopus - 29 Citations

INSPEC

Scientific classification

FOS: Engineering and technology > Chemical engineering

Associated Projects

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

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7