Biomimetic synthesis of calcium carbonate controlled by anionic amino acid surfactant

N-Lauroylsarcosine sodium(Sar-Na) was used to control calcium carbonate crystalization in ethanol or ethanol/water solution at ambient temperature. By means of SEM, XRD and IR, the morphology and structure of the samples were characterized. It is, revealed that with increasing the reaction time, the morphology of the CaCO3 particles generally varies from aragonite polyhedron to amorphous calcium carbonate spheres in pure ethanol and in the ethanol/water solution, with increasing the amount of N-lauroylsarcosine sodium, the morphology of the CaCO3 particles varies from flower-like to spheres. Pure vaterite crystals with a spheres shape were obtained at n(Ca2+) : n(Sar) = 1:2. At a fixed n(Ca2+) : n(Sar) = 1:1, with increasing the volume fractions of distilled water, the morphology of the CaCO3 particles varies from flower-like to spheres.