Morphologies of calcium carbonate crystallites grown from aqueous solutions containing polyethylene glycol

摘要

Calcium Carbonate has been precipitated from aqueous solutions containing different concentrations and different molecular weight of Polyethylene Glycol (PEG). The precipitations were analyzed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The results demonstrated that PEG has profound influence on the nucleation and crystal growth of CaCO3, under condition of low PEG6000 (refer to PEG M-w=6000) concentration, it favored the formation of calcite, while high PEG6000 concentration promoted vaterite formation. Additionally, low molecular weight PEG can stabilize vaterite phase. (C) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.