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Title: Reflections on the mechanism of calcium phosphate nucleation on titanium in simulated body fluids
Authors: Cheng, FT
Keywords: Calcium phosphate
Hydroxyl group
Point of zero charge
Simulated body fluid
Surface charge
Issue Date: 2005
Publisher: Elsevier
Source: Journal of materials science & technology, 2005, v. 21, no. 5, p. 613-617 How to cite?
Journal: Journal of materials science & technology 
Abstract: The results and main findings of studies reported in the literature in relation to the deposition of calcium phosphate on Ti in simulated body fluids are summarized. The effects of the surface hydroxyl groups and the sign of surface charge on the nucleation of calcium phosphate are reviewed. One major controversy among the conclusions of different studies is the order of adsorption of the calcium ions and the phosphate ions in the initial stage of immersion. A simple model based on the amphoteric nature of the hydroxyl groups on Ti is proposed in an attempt to delineate the nucleation process for calcium phosphate on Ti in simulated body fluids. HPO42- ions interact with the hydroxyl groups via ion exchange and/or electrostatic attraction, and Ca2+ ions, via electrostatic attraction only. There is no preferential order of adsorption. Seemingly inconsistent results in different studies possibly arise from different prior treatments of the samples, which affect the adsorption properties.
ISSN: 1005-0302
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