Abstract
Poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) ((EO) 20–(PO) 72–(EO) 20) and O-(hydroxy isopropyl) chitosan (HPCHS) were employed as control agents of calcium carbonate crystal growth. The effect of the concentrations of polymers, [Ca 2+] and [CO 3 2−], the ratios of [Ca 2+]–[CO 3 2−] and the initial pH of the solutions were investigated. The obtained CaCO 3 particles were characterized by scanning electron microscopy (SEM), powder X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The particles are mainly calcite with various morphologies; their size and morphologies are influenced by the polymer content. For (EO) 20–(PO) 72–(EO) 20 systems, the initial pH has a notable influence; but in the HPCHS solution pH shows little influence. The ratio of [Ca 2+]–[CO 3 2−] clearly affects the CaCO 3 particle size and aggregation degree. HPCHS showed more significant influence on CaCO 3 crystallization than (EO) 20–(PO) 72–(EO) 20. The mechanisms of the CaCO 3 crystallization as controlled by (EO) 20–(PO) 72–(EO) 20 and HPCHS are proposed and demonstrated by the molecular dynamics simulations.
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