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Hydration dynamics in CaCO3 nucleation by THz spectroscopy

Type of Publication: Contribution to a conference collection
Publication status: Published
Author: Sebastiani, Federico; Wolf, Stefan L. P.; Born, Benjamin; Luong, Trung Quan; Cölfen, Helmut; Gebauer, Denis; Havenith, Martina
Year of publication: 2017
Conference: 2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), Aug 27, 2017 - Sep 1, 2017, Cancún, Mexico
Published in: 2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves : Cancun, Quintana Roo, Mexico, August 27-September 1, 2017. - Piscataway, NJ : IEEE, 2017. - eISSN 2162-2035. - ISBN 978-1-5090-6050-4
DOI (citable link): https://dx.doi.org/10.1109/IRMMW-THz.2017.8066992
Summary:
In CaCO3 nucleation, the role of water remains enigmatic. Changes in THz absorption during the early stages of CaCO3 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 CaCO3 forms through solidification of initially liquid precursors. Polycarboxylates, which stabilize CaCO3 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.
Subject (DDC): 540 Chemistry
Bibliography of Konstanz: Yes

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SEBASTIANI, Federico, Stefan L. P. WOLF, Benjamin BORN, Trung Quan LUONG, Helmut CÖLFEN, Denis GEBAUER, Martina HAVENITH, 2017. Hydration dynamics in CaCO3 nucleation by THz spectroscopy. 2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). Cancún, Mexico, Aug 27, 2017 - Sep 1, 2017. In: 2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves : Cancun, Quintana Roo, Mexico, August 27-September 1, 2017. Piscataway, NJ:IEEE. eISSN 2162-2035. ISBN 978-1-5090-6050-4. Available under: doi: 10.1109/IRMMW-THz.2017.8066992

@inproceedings{Sebastiani2017-08Hydra-41507, title={Hydration dynamics in CaCO3 nucleation by THz spectroscopy}, year={2017}, doi={10.1109/IRMMW-THz.2017.8066992}, isbn={978-1-5090-6050-4}, address={Piscataway, NJ}, publisher={IEEE}, booktitle={2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves : Cancun, Quintana Roo, Mexico, August 27-September 1, 2017}, author={Sebastiani, Federico and Wolf, Stefan L. P. and Born, Benjamin and Luong, Trung Quan and Cölfen, Helmut and Gebauer, Denis and Havenith, Martina} }

Luong, Trung Quan 2018-02-21T08:46:35Z eng Gebauer, Denis Wolf, Stefan L. P. Havenith, Martina Sebastiani, Federico Sebastiani, Federico Gebauer, Denis Born, Benjamin Cölfen, Helmut Cölfen, Helmut Luong, Trung Quan Havenith, Martina Wolf, Stefan L. P. 2018-02-21T08:46:35Z Born, Benjamin Hydration dynamics in CaCO3 nucleation by THz spectroscopy In CaCO<sub>3</sub> nucleation, the role of water remains enigmatic. Changes in THz absorption during the early stages of CaCO<sub>3</sub> 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<sub>3</sub> forms through solidification of initially liquid precursors. Polycarboxylates, which stabilize CaCO<sub>3</sub> 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. 2017-08

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