Preparation of monodispersed cubic calcium carbonate particles via precipitation reaction

摘要

Monodispersed cubic calcium carbonate composite particles were prepared by the precipitation reaction of sodium carbonate with calcium chloride in water in the presence of polyacrylic acid (PAA) at 60-80 deg C, and then characterized with scanning electron microscopy (SEM), X-ray diffraction (XRD) and Differential Scanning Calorimetry-Thermogravimetry (DSC-TG). It was found from the above results that variations in the concentration of PAA and CaCO_3, molar ratio of PAA to CaCO_3, and pH and temperature of solution drastically changed the morphology of the as-produced CaCO_3 particles, but all the products obtained consisted of calcite crystals. The optimal experimental conditions for the production of cubic calcite particles were determined. The amount of PAA in the cubic calcite composite particles was about 1.4 percent.