engleski

Factors Influencing Additive Interactions with Calcium Hydrogenphosphate Dihydrate Crystals

The effect of aspartic acid, glutamic acid, hexaammonium tetrapolyphosphate, calcium phytate and polyaspartic acid on calcium hydrogenphosphate dihydrate (CaHPO4ˇ2H2O, DCPD) crystal growth morphology was studied. Mechanism of additive-DCPD crystals interaction depends on size and structure of additive molecule, structural fit between organic molecule and the ionic structure of particular crystal face. Small molecules with low charge (aspartic and glutamic acid) do not have significant effect, while small molecules with several functional groups (citrate and hexaammonium tetrapolyphosphate) adsorb on lateral faces primarily by electrostatic interactions. Molecules with hindered structure (phytate) and macromolecules (polyaspartic acid) specifically adsorb on dominant (010) face, for which certain degree of structural fit is necessary.

calcium hydrogenphosphate dihydrate; crystal growth; mechanisms of additive interactions

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