Abstract
The dendrite-shaped aragonite particles have been synthesized through the carbonation route, in which CO 2 gas is bubbled through aqueous slurry of calcium hydroxide, in the presence of polyacrylic acid (PAA) at high temperature. The as-prepared products were characterized with scanning electron microscope, X-ray diffraction and transmission electron microscope with selected area electron diffraction. It was found that the dendrite-shaped aragonite particle present the single-crystal feature. The effects of the reaction temperature and the concentration of PAA on the crystal polymorphs and morphologies of the as-prepared calcium carbonate were investigated. The results showed that both the organic additive and the reaction temperature turned out to be important parameters for the biomimetic synthesis of the dendrite-shaped aragonite particle. This research may provide new insight into the control of the polymorphs and morphologies of calcium carbonate.
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