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Issue 44, 2015
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A facile method to control the structure and morphology of α-calcium sulfate hemihydrate

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Abstract

We report a facile method to control the structure and morphology of alpha-calcium sulfate hemihydrate (α-HH) crystals precipitated in Na2EDTA-containing ethylene glycol aqueous solutions by simply tuning the volume ratio of ethylene glycol to water (G/W). At a low G/W from 0.4 to 2.5, single crystalline α-HH particles with a hexagonal prism shape precipitate from the solution, the corresponding aspect ratio of the prisms varies from 2.7 to 0.1. While at a high G/W from 5.0 to 50.0, polycrystalline α-HH particles form with spherical and ellipsoidal shapes and the diameter of the polycrystalline spheres reduces from 2 μm to 300 nm. The synergetic effect of supersaturation and Na2EDTA activity resulting from G/W accounts for the evolution of the structure and morphology of α-HH. This method allows α-HH synthesis in micro- and nanoscale size, thus enabling its morphology/structure-dependent applications.

Graphical abstract: A facile method to control the structure and morphology of α-calcium sulfate hemihydrate

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The article was received on 29 Sep 2015, accepted on 08 Oct 2015 and first published on 08 Oct 2015


Article type: Paper
DOI: 10.1039/C5CE01923K
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Citation: CrystEngComm, 2015,17, 8549-8554
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    A facile method to control the structure and morphology of α-calcium sulfate hemihydrate

    Q. Chen, G. Jiang, C. Jia, H. Wang and B. Guan, CrystEngComm, 2015, 17, 8549
    DOI: 10.1039/C5CE01923K

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