A Method for Simultaneously Precipitating and Dispersing Nano-Sized Calcium Phosphate Suspensions
Stable and relatively concentrated aqueous suspensions of nano-sized stoichiometric hydroxyapatite could be prepared by a precipitation method in the presence of suitable surface active agent (SAA). The method includes the precipitation, vacuum filtration and washing of the precipitated powders, followed by re-dispersion. It could be concluded that the added amount of the SAA should be enough to cover the primary particles surface, and that washing should be better carried out using a SAA solution. The method developed enables the precipitation of the powders and the preparation of suspensions, while significantly shortening the overall time required for colloidal processing consuming.
Panjian Li, Kai Zhang and Clifford W. Colwell, Jr.
A.F. Lemos et al., "A Method for Simultaneously Precipitating and Dispersing Nano-Sized Calcium Phosphate Suspensions ", Key Engineering Materials, Vols. 284-286, pp. 67-70, 2005