Enhanced Polymer Induced Precipitation of Polymorphous in Calcium Carbonate: Calcite Aragonite Vaterite Phases

摘要

The role of polymer in precipitation has been examined by studying the effect of poly(ethylene glycol) (PEG) on the formation of calcium carbonate particles. Absence of polymer led to the formation of calcite crystals. Introduction of poly (ethylene glycol) molecules reduced the rate of crystallization process, and the effect is dependent on molecular weight and concentration. In the presence of 0.01 mol L-1 PEG, after 3 h of precipitation initiation, aragonite, vaterite phase appeared in the system. The calcium carbonate obtained with PEG was characterized by smaller sized particles in comparison with the ones without polymer. The CaCO3 particles were characterized by several techniques, such as FTIR, XRD, SEM, and particle size distribution analysis.