Effects of PAA additive and temperature on morphology of calcium carbonate particles

摘要

Calcium carbonate particles with Various shapes were prepared by the reaction of sodium carbonate with calcium chloride in the absence and presence of a polyacrylic acid (PAA) at 25degreesC and 80degreesC, respectively. The as-prepared products were characterized with scanning electron microscopy and X-ray diffraction. The effects of pH, temperatures, aging time and concentration of PAA and CaCO3 on the crystal form and morphologies of the as-prepared CaCO3 were investigated. The results show that pH, temperatures, concentration of PAA and CaCO3 are important parameters for the control of morphologies of CaCO3. Various crystal morphologies of calcite, Such Lis, plates, rhombohedras, rectangles, ellipsoids, Cubes, etc. can be obtained depending on the experimental conditions. Especially, the monodispersed cubic calcite particles can be produced by PAA addition at 80degreesC. Moreover, higher temperature is beneficial to the formation of monodispersed Cubic or rectangular calcite particles. This research may provide new insight into the control of morphologies Of Calcium carbonate and the biominietic synthesis of novel inorganic materials. (C) 2003 Elsevier Inc. All rights reserved. [References: 33]