3 years ago

>>On demand<< triggered crystallization of CaCO3 from solute precursor species.

Alejandro Fernandez-Martinez, Teresa Roncal-Herrero, Roland Kroeger, Liane G. Benning, Adriana Matamoros Veloza, Tomasz M. Stawski

Can we control the crystallization of solid CaCO3 from supersaturated aqueous solutions and thus mimic a natural process predicted to occur in living organisms that produce biominerals? Here we show how we achieved this by confining the reaction between Ca2+ and CO32- ions to the environment of nanosized water cores of water-in-oil microemulsions. Using a combination of in situ small-angle X-ray scattering, high-energy X-ray diffraction, and low-dose liquid-cell scanning transmission electron microscopy, we elucidate how the presence of micellar interfaces leads to the formation of a solute CaCO3 phase that can be stabilized for extended periods of time inside micellar water nano-droplets. We can also control and >>on-demand<< trigger the actual precipitation and crystallization of solid CaCO3 phases through the targeted removal of the organic-inorganic interfaces.

Publisher URL: http://arxiv.org/abs/1801.05685

DOI: arXiv:1801.05685v1

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