Journal of Chemical Sciences | |
Para-amino benzoic acid–mediated synthesis of vaterite phase of calcium carbonate | |
K Pallavi1  S A Inchara1  T N Ramesh11  | |
[1] Department of Studies and Research in Chemistry and Prof. C N R Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103, India$$ | |
关键词: Calcium carbonate; chemical synthesis; vaterite; polymorphism; X-ray diffraction; morphology.; | |
DOI : | |
来源: Indian Academy of Sciences | |
【 摘 要 】
Calcium carbonate polymorphs were precipitated at room temperature and 80°C by varying the precipitation pH, carbonate source, effect of solvent in presence and absence of structure directing agent such as para-aminobenzoic acid. Calcite phase of calcium carbonate was obtained when sodium hydrogen carbonate and/or sodium carbonate (used as precipitating agents) were added to calcium chloride solution at different pHs in water and/or methanol as solvent in separate experiments. Vaterite phase of calcium carbonate (CaCO3) has been synthesized by mixing calcium chloride and sodium carbonate in presence of para-aminobenzoic acid when water–methanol binary mixture was used as solvent. Vaterite phase of calcium carbonate crystallizes in P63/mmc, while that of calcite phase in R-3mc, respectively. Calcite phase of calcium carbonate exhibits rhombohedral morphology, while vaterite phase has spherical morphology.
【 授权许可】
Unknown
【 预 览 】
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