Aqueous foams as templates for the synthesis of calcite crystal assemblies of spherical morphology

Debabrata Rautaray, Kaustav Sinha, S. Shiv Shankar, Suguna D. Adyanthaya, Murali Sastry

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The crystallization of calcite in the form of spheroaggregates in aqueous foam stabilized by the surfactant sodium bis-2-ethylhexyl-sulfosuccinate (aerosol OT, AOT) by a method of ion entrapment is described. Reaction of Na2CO3 with Ca2+ ions electrostatically entrapped in the foam results in the formation of flat, platelike calcite crystals, possibly in the plateau border regions of the foam. Hydrodynamic flow patterns in the foam are believed to transport the calcite platelets from the plateau border regions into the larger plateau junctions where they assemble into spherical structures by hydrophobic association. The large interfacial area of the liquid lamellae in the foam provides an attractive and versatile template for the large-scale synthesis of not only minerals but also other nanoscale materials.

Original languageEnglish
Pages (from-to)1356-1361
Number of pages6
JournalChemistry of Materials
Issue number7
Publication statusPublished - 6 Apr 2004
Externally publishedYes

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