Biomimetic synthesis of calcium carbonate (CaCO₃) with various sizes and morphologies using organic matrix has become an interesting hotspot. CaCO₃ was synthesised by the reaction of Na₂CO₃ and CaCl₂ in the presence of xanthan gum (XG). The results showed that the fresh mineralised CaCO₃/XG were microspheres with large surface area and porosity. The original CaCO₃/XG microspheres transformed to brick-like CaCO₃ after ageing 7 days at 4°C. During the morphology transformation, CaCO₃ spheres rearranged by attaching to XG molecular, and transformed from a macroscopic view of CaCO₃ microspheres to a hexahedral structure related with the XG uncoiled single chains re-associating into loose several-fold helix. The study demonstrated that environmental effect coupled XG could be one feasible approach to regulate the structure of CaCO₃.

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Biomimetic mineralisation of calcium carbonate using xanthan gum as morphology control agent

References

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