• Para-amino benzoic acid–mediated synthesis of vaterite phase of calcium carbonate

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      http://www.ias.ac.in/article/fulltext/jcsc/127/05/0843-0848

    • Keywords

       

      Calcium carbonate; chemical synthesis; vaterite; polymorphism; X-ray diffraction; morphology.

    • Abstract

       

      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.

    • Author Affiliations

       

      T N Ramesh1 S A Inchara1 K Pallavi1

      1. Department of Studies and Research in Chemistry and Prof. C N R Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103, India
    • Dates

       
    • Supplementary Material

       
  • Journal of Chemical Sciences | News

© 2017 Indian Academy of Sciences, Bengaluru.