Hollow rhombohedral calcite crystals encompassing CO2 microcavities nucleated in solution

Dino Aquilano, Emanuele Costa, Alessandro Genovese, Francesco Roberto Massaro, Linda Pastero, Marco Rubbo

    Research output: Contribution to journalArticlepeer-review

    26 Scopus citations

    Abstract

    A new way for heterogeneous nucleation of crystals from the solution is described: 3D crystalline structure can nucleate and grow encompassing gaseous cavities, formed on solid substrates in the aqueous solution, so giving rise to crystal bubbles. The double surface of a crystal bubble is made, in this case, by the faces of the cleavage calcite rhombohedron separating the solution from the enclosed gas cavity. The faces thickness and the edges length amount to a few nanometers and to about 5 μm, respectively. Then, the surface-to-volume ratio is the highest obtained for 3D crystals, amidst the consulted literature. Bubbles' shape is explained through the equilibrium properties of crystal-cavity and crystal-solution interfaces and in terms of growth mechanisms operating on the separate interfaces. The nucleation of the crystals around gas cavities can provide new insight on those mineralization phenomena where the gas phase participate in crystal growth. Potential applications are also envisaged concerning the nucleation of the gas cavities on peculiar templates which impose 1D (or 2D) periodicity to crystal bubbles, in order to obtain 1D and/or 2D photonic crystals.

    Original languageEnglish (US)
    Pages (from-to)516-522
    Number of pages7
    JournalJournal of Crystal Growth
    Volume247
    Issue number3-4
    DOIs
    StatePublished - Jan 1 2003

    Keywords

    • A1. Heterogeneous nucleation
    • A2. Solution growth
    • B1. Calcite
    • B1. Nanocrystals

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Inorganic Chemistry
    • Materials Chemistry

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