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Issue 25, 2013
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Monodisperse spherical CaCO3 superstructure self-assembled by vaterite lamella under control of regenerated silk fibroin via compressed CO2

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Abstract

In this paper, spherical calcium carbonate (CaCO3) with ordered lamella nanostructure was prepared by using regenerated silk fibroin (RSF) as a crystal modifier via compressed CO2. The crystal morphology could be tuned from lens-like to spherical by altering RSF concentration, reaction time, and temperature. Time-resolved experiments showed that the lamellas were formed by several nanoparticles’ aggregation and orientation. Amorphous calcium carbonate (ACC) was seized in the early stage, which would transform to vaterite in a short period. And the dissolution–recrystallization process of CaCO3 was found in a later stage, which was consistent with Ostwald ripening, resulting in the decrease of lamella thickness and the release of RSF that was absorbed in the crystal. Finally, a possible mechanism for the formation of spherical CaCO3 crystal was proposed.

Graphical abstract: Monodisperse spherical CaCO3 superstructure self-assembled by vaterite lamella under control of regenerated silk fibroin via compressed CO2

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Publication details

The article was received on 28 Jan 2013, accepted on 26 Apr 2013 and first published on 30 Apr 2013


Article type: Paper
DOI: 10.1039/C3CE40181B
Citation: CrystEngComm, 2013,15, 5179-5188
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    Monodisperse spherical CaCO3 superstructure self-assembled by vaterite lamella under control of regenerated silk fibroin via compressed CO2

    S. Xu and P. Wu, CrystEngComm, 2013, 15, 5179
    DOI: 10.1039/C3CE40181B

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