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The Nucleation and Growth of Calcium Phosphate Crystals

G. H. Nancollas ; Chemistry Department, State University of New York at Buffalo, Buffalo, New York, U.S.A.

Puni tekst: engleski pdf 5.776 Kb

str. 261-266

preuzimanja: 457



The growth of seed crystals in supersaturated solutions of
calcium phosphate at 25° C is discussed. In the pH range 5-6, the
crystallization of dicalcium phosphate follows a second order rate
equation in a process which is surface reaction rather than· diffusion
controlled. Under physiological pH conditions, the growth
of hydroxyapatite seed crystals proceeds through the formation
of a precursor phase which has a calcium : phosphate ratio of
1.45 ± 0.05 and which attains the HAP composition after slow
interaction with the medium; the process again appears to be
interface controlled.

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