Abstract
Barium carbonate crystals with higher-order superstructures have been successfully synthesized in a simple aqueous system containing a general polymer, polyacrylamide (PAM) at room temperature. BaCl 2, NaHCO 3 and NH 3·H 2O were used as the starting reagents. The X-ray powder diffraction (XRD) analysis showed the product was the orthorhombic BaCO 3. Scanning electron microscopy (SEM) observations showed that higher-order superstructures were formed by the self-assembly of BaCO 3 nanorods. Research showed that the morphology of the as-synthesized BaCO 3 crystals could gradually evolve with the reaction time. Also, the morphology of BaCO 3 crystals was affected by the initial concentrations of reactants: lower concentrations were used for the formation of dumbbell-shaped BaCO 3 crystals. Based on the experimental results, a possible formation mechanism of BaCO 3 superstructures was discussed.
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