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Issue 14, 2011
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Kinetic control of particle-mediated calcium carbonate crystallization

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By changing the temperature, pH, stirring rate, or time for calcium carbonate crystallization, complex shapes of aggregated calcium carbonates formed. Such shapes have earlier been ascribed to specific interactions with specialized additives. Without polymeric additives, aggregates of vaterite transformed more rapidly into calcite aggregates under slow than under fast stirring. With an anionic polyelectrolyte added, vaterite was stabilized. Larger polycrystalline aggregates of vaterite formed under rapid than under slow stirring, indicative of a particle mediated growth of aggregates controlled by convective currents. The size of the underlying nanoparticles was temperature dependent, with grain sizes of ∼20 to 50 nm at 20 °C and ∼350 nm at 90 °C. The small differences in free energy between the anhydrous polymorphs of calcium carbonate made both kinetic and equilibrium dependencies important.

Graphical abstract: Kinetic control of particle-mediated calcium carbonate crystallization

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The article was received on 27 Jan 2011, accepted on 04 Apr 2011 and first published on 27 Apr 2011

Article type: Paper
DOI: 10.1039/C1CE05142C
Citation: CrystEngComm, 2011,13, 4641-4645

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    Kinetic control of particle-mediated calcium carbonate crystallization

    B. Aziz, D. Gebauer and N. Hedin, CrystEngComm, 2011, 13, 4641
    DOI: 10.1039/C1CE05142C

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