Abstract:

Crystal growth of calcium hydrogenphosphate dihydrate (DCPD), in the presence of polyaspartic acid or calcium phytate (system A), as well as nucleation and growth of octacalcium phosphate (OCP), in the presence of poly-L-lysine, poly-L-glutamic acid or polystyrene sulfonate (system B) were investigated. In system A crystn. of DCPD was inhibited and the crystal growth morphol. was specifically modified by preferential interaction of the resp. additive with the dominant (010) crystal face. In system B crystals were formed via precursor phase(s) and polyelectrolytes exhibited dual action, at low concns. inducing and at high concns. inhibiting nucleation of the cryst. phase. Crystal/additive interactions controlling growth were nonspecific and resulted in smaller crystals with rounded edges, but with the same basic orientation as in the controls. [on SciFinder(R)]