Abstract

The heterogeneous nucleation of calcium oxalate onto colloidal oxides from aqueous solution has been studied as a model system for understanding the role of surface chemistry in biomimetic processes. The Constant Composition technique was used for measuring nucleation induction times. Results show that the dependence of nucleation on supersaturation fit well with classical nucleation theories. Surfaces which are anionic appear to promote calcium oxalate nucleation better that neutral or cationic surfaces. Modifications to positive surfaces via the adsorption of anionic surfactants, lower the effective energy barrier for nucleation, and stimulates the heterogeneous nucleation of calcium oxalate

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