Dissolution of calcium-deficient hydroxyapatite synthesized at different conditions
The dissolution characteristics of several calcium-deficient hydroxyapatites (HA) have been investigated. Eleven samples were produced by varying synthesis parameters like temperature, pH, digestion time, reagent concentration and velocity of addition. Powder characterization was conducted using X-ray diffraction. Sample crystallinity was variable and samples examined by transmission electron microscopy showed acicular or plate-like morphology. After sample dissolution in Milli-Q water for 168 h, the calcium and phosphate contents in solution were measured by induced coupled plasma optical emission spectrometry (OES). The dissolution behavior of calcium-deficient HA was highly dependent on the sample calcium/phosphorus (Ca/P) molar ratio of the original HA. Dissolution in water was enhanced with decreasing HA sample molar ratio. However, the dissolution process equilibrium was not achieved at the end of 168 h (7 days)
- OSTI ID:
- 20748696
- Journal Information:
- Materials Characterization, Vol. 50, Issue 2-3; Conference: Brazilian Materials Research Society symposia on current trends in nanostructured materials, semiconductor Materials, thin films, and biomaterials, Rio de Janeiro (Brazil), 7-10 Jul 2002; Other Information: DOI: 10.1016/S1044-5803(03)00093-7; PII: S1044580303000937; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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