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Additives control the stability of amorphous calcium carbonate via two different mechanisms : surface adsorption versus bulk incorporation

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Zou,  Zhaoyong
Wouter Habraken (Indep. Res.), Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Albéric,  Marie
Yael Politi, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Heil,  Tobias
Nadezda V. Tarakina, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Politi,  Yael
Yael Politi, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Bertinetti,  Luca
Luca Bertinetti, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Citation

Zou, Z., Yang, X., Albéric, M., Heil, T., Wang, Q., Pokroy, B., et al. (2020). Additives control the stability of amorphous calcium carbonate via two different mechanisms: surface adsorption versus bulk incorporation. Advanced Functional Materials, 2000003. doi:10.1002/adfm.202000003.


Cite as: http://hdl.handle.net/21.11116/0000-0006-3E70-7
Abstract
Abstract The mechanisms by which organisms control the stability of amorphous calcium carbonate (ACC) are yet not fully understood. Previous studies have shown that the intrinsic properties of ACC and its environment are critical in determining ACC stability. Here, the question, what is the effect of bulk incorporation versus surface adsorption of additives on the stability of synthetic ACC, is addressed. Using a wide range of in situ characterization techniques, it is shown that surface adsorption of poly(Aspartic acid) (pAsp) has a much larger stabilization effect than bulk incorporation of pAsp and only 1.5% pAsp could dramatically increase the crystallization temperature from 141 to 350 °C. On the contrary, surface adsorption of PO43- ions and OH- ions does not effectively stabilize ACC. However, bulk incorporation of these ions could significantly improve the ACC stability. It is concluded that the stabilization mechanism of pAsp is entirely different from that of PO43- ions and OH- ions: while pAsp is effectively inhibiting calcite nucleation at the surface of ACC particle, the latter acts to modify the ion mobility and delay crystal propagation. Thus, new insights on controlling the stability and crystallization processes of metastable amorphous materials are provided.