Dispersing Behavior of Hydroxyapatite Powders Produced by Wet-Chemical Synthesis |
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Authors: | Michele Pretto Anna Luisa Costa Elena Landi Anna Tampieri Carmen Galassi |
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Affiliation: | National Research Council, Institute of Science and Technology for Ceramics (CNR-ISTEC), I-48018 Faenza, Italy |
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Abstract: | Three hydroxyapatite powders with different surface properties were produced by wet-chemical synthesis and characterized. The electrokinetic properties of powders dispersed in water were investigated by electroacoustic spectroscopy measurements. The different surface reactivity (pHiep and ζ potential versus pH curves) was related to the interplay of dissolution and adsorption of Ca2+ ions. With a view toward the preparation of porous bodies by sponge impregnation, the behavior of powder suspensions was studied. Four deflocculants were tested, and the optimum dispersing conditions for each powder were found. Anionic polyelectrolytes resulted in the best effective dispersing agent, with different optimum amounts added to the suspensions. |
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Keywords: | hydroxyapatite powders dispersants/dispersion |
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