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Hydration dynamics in CaCO3 nucleation by THz spectroscopy

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Authors
Sebastiani, F.
Wolf, S.
Born, B.
Luong, T.
Colfen, H.
Gebauer, Denis
Havenith, M.
Date
2017
Type
Conference Paper

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Sebastiani, F. and Wolf, S. and Born, B. and Luong, T. and Colfen, H. and Gebauer, D. and Havenith, M. 2017. Hydration dynamics in CaCO3 nucleation by THz spectroscopy, 2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2017).
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International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
Source Conference
2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2017)
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School of Molecular and Life Sciences (MLS)
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Abstract

© 2017 IEEE. In CaCO 3 nucleation, the role of water remains enigmatic. Changes in THz absorption during the early stages of CaCO 3 nucleation evidence altered coupled motions of hydrated calcium and carbonate ions. By high precision THz absorption measurements we were able to follow the changes in the hydration bond dynamics during nucleation. Our THz data strongly suggest that amorphous CaCO 3 forms through solidification of initially liquid precursors. Polycarboxylates, which stabilize CaCO 3 liquid precursors, significantly enhance the kinetic stability of the metastable liquid-liquid state. The importance of water network dynamics in phase separation mechanisms as tested by THz absorption measurements using a p-Ge spectrometer is likely to be more general for aqueous systems.