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Dispersing Behavior of Hydroxyapatite Powders Produced by Wet‐Chemical Synthesis
Author(s) -
Pretto Michele,
Costa Anna Luisa,
Landi Elena,
Tampieri Anna,
Galassi Carmen
Publication year - 2003
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2003.tb03510.x
Subject(s) - electrokinetic phenomena , dispersant , dissolution , chemical engineering , adsorption , materials science , porosity , polyelectrolyte , dispersion (optics) , chemistry , organic chemistry , nanotechnology , composite material , polymer , physics , engineering , optics
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 (pH iep and ζ potential versus pH curves) was related to the interplay of dissolution and adsorption of Ca 2+ 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.