Bands, spherulites and 3D zonation in the carbonation of a slaked lime gel matrix
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Elsevier B.V.
Abstract
We investigate the formation of CaCO3 zonation using a displacement reaction in the solid phase through the diffusion of aqueous carbonic acid into a slaked lime [Ca(OH)2] gel putty. The obtained calcium carbonate gives rise to a variety of mosaic patterns, and interesting zonation in 3D. The system also displays Liesegang banding. We use pH measurements, scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and powder X-ray diffraction (XRD), for the characterization of the various differentiated zones within the pattern, and the crystalline forms therein. © 2021 Elsevier B.V.
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Calcite, Calcium carbonate, Carbonation, Liesegang, Mosaic patterns, Portlandite, Reaction–diffusion, Slaked lime, Spherulites, Zonation, Carbon dioxide, Fourier transform infrared spectroscopy, Lime, Scanning electron microscopy, Substitution reactions, Displacement reactions, Gel matrix, Reaction-diffusion, Slaked-lime, Solid-phase, Spherulite, Hydrated lime