Abstract
The effect of the presence in solution of neutral or anionic hydrosoluble polymers on the kinetics of dissolution of hydroxyapatite powder (HAP) is analysed at a constant pH of 5 and under well-controlled conditions. Four polymers are studied. It is shown that the polymers that are able to be adsorbed induce a decrease in the rate of dissolution which strongly depends on the chemical structure of the polymers. Chemical groups with the ability to bind calcium ions, such as phosphate and phosphonate groups, are particularly efficient. The results are interpreted with the use of a recently proposed apatite dissolution model which assumes the formation, at the apatite interface, of an ionic semipermeable layer produced by the adsorption of calcium ions. According to this model, adsorbed polymers increase the ionic capacity of the interface.
Published Version
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