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Modelling calcium carbonate biomineralisation processes.

Saratchandra Babu Mukkamala1, Christopher E Anson, Annie K Powell

  • 1Institut für Anorganische Chemie der Universität Karlsruhe, Engesserstrasse 15, D76131 Karlsruhe, Germany.

Journal of Inorganic Biochemistry
|May 3, 2006
PubMed
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Organic dicarboxylates influence calcium carbonate (CaCO3) polymorph formation and crystal morphology under hydrothermal conditions. Different templates and reaction conditions yield calcite, aragonite, and vaterite, with varying crystal shapes observed.

Area of Science:

  • Materials Science
  • Crystallography
  • Inorganic Chemistry

Background:

  • Calcium carbonate (CaCO3) exists in multiple polymorphs, including calcite, aragonite, and vaterite.
  • Controlling CaCO3 polymorph and morphology is crucial for various applications.
  • Organic molecules can act as structure-directing agents in crystal formation.

Purpose of the Study:

  • To investigate the structure-directing influence of dicarboxylates on CaCO3 formation.
  • To explore the effect of temperature and reactant ratios on CaCO3 polymorphs.
  • To examine template-induced morphological changes in CaCO3 crystals.

Main Methods:

  • Hydrothermal synthesis of CaCO3 using malonate, succinate, glutarate, and adipate as templates.
  • Varying reaction temperatures (60-190°C) and Ca2+/template molar ratios.

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  • Characterization using powder X-ray diffraction and Scanning Electron Microscopy (SEM).

    • Main Results:

    • Dicarboxylates enabled the formation of one, two, or three CaCO3 polymorphs (calcite, aragonite, vaterite) depending on reaction conditions.
    • Template concentration significantly altered CaCO3 crystal morphology.
    • Ambient synthesis with specific ligands (H3heidi, H5hpdta) produced distinct calcite morphologies (otolith-like, microtrumpets).

    Conclusions:

    • Organic dicarboxylates effectively template CaCO3 polymorph and morphology under hydrothermal conditions.
    • Reaction parameters critically influence the outcome of CaCO3 synthesis.
    • Specific chelating ligands can induce unique and complex calcite crystal structures.