(Sub)Micron CaF2 Cubes and Hollow Rods From Ionic Liquid Emulsions
Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland.
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Uniform CaF2 cubes and rods with a well-defined crystal habit have been grown from emulsions of an ionic liquid (IL) in aqueous CaCl2 solutions via the hydrolysis of the PF6– counterion of the IL. Intriguingly, at high IL contents, hollow CaF2 rods form, which has not been observed before. The rods can reach lengths up to over ten micrometers and widths of up to ca. 2.5 mm. Furthermore, the surface of the IL droplet has a strong influence on the nucleation efficiency of the precipitating mineral.
Key words: ionic liquids, emulsions, calcium fluoride, hollow rods