The Surface Energy and Structure of Nuclei at Calcium Sulfate Dihydrate Crystallization from Aqueous Solutions
DOI:
https://doi.org/10.15407/ujpe66.8.708Keywords:
crystallization, surface energy, concentrations of components, induction period, micelles, photometryAbstract
Crystallization of CaSO4 · 2H2O at the varying Ca2+ and the constant SO2−4 ion concentrations has been studied. It is found that the concentration of CaSO04 complexes can exceed the concentration of Ca2+ ions, which influences the crystallization conditions, in particular, the supersaturation. Based on the induction period measurements, the surface energy of nuclei was determined. This parameter was found to change within an interval of 6.4–10.8 mJ/m2 depending on the ratio between the concentrations of Ca2+ ions and CaSO04 complexes. We assume that the surface energy value depends on the prenucleus formation conditions. We adopt that prenuclei are micelles the nuclei of which undergo the recharging when passing from CCa2+ < CSO2−4 to CCa2+ > CCaSO04 > CSO2−4.
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