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Surface effects in the crystal growth of calcium oxalate monohydrate



Surface effects in the crystal growth of calcium oxalate monohydrate



Journal of Colloid & Interface Science 118(2): 379-386



The rates of growth of calcium oxalate monohydrate crystals have been measured under conditions of constant supersaturation over a range of concentrations and in the presence of an inhibitor, N,N,N'1,N'1-ethylenediaminetetra(methylene phosphonic) acid ENTMP. Changes in the measured specific surface area during the growth reactions are consistent with the observed morphologies of the developing crystals. Well-aged seed crystals undergo a rapid crystal lattice perfection during the initial stages of the reaction which is accompanied by a marked decrease in specific surface area. Initial rates of crystallization are therefore markedly dependent upon the surface properties of the seed crystals. These results emphasize the importance of using well-developed pregrown crystal surfaces in designing experimental studies of the characterization of the mechanism of crystal growth. This is especially important when comparing the influence of adsorbing inhibitor molecules on the crystal growth reactions. The adsorption of ENTMP at the crystal surfaces has been investigated by equilibrium and mobility measurements.

Accession: 006546893

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DOI: 10.1016/0021-9797(87)90473-5

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