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Control of Polymorph Selection in Amorphous Calcium Carbonate Crystallization by Poly(Aspartic Acid): Two Different Mechanisms

MPG-Autoren
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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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Bertinetti,  Luca
Luca Bertinetti (Indep. Res.), Biomaterialien, 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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Fratzl,  Peter
Peter Fratzl, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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

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Zitation

Zou, Z., Bertinetti, L., Politi, Y., Fratzl, P., & Habraken, W. (2017). Control of Polymorph Selection in Amorphous Calcium Carbonate Crystallization by Poly(Aspartic Acid): Two Different Mechanisms. Small, 13(21): 1603100. doi:10.1002/smll.201603100.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-002C-F21F-E
Zusammenfassung
Poly(aspartic acid) (pAsp) is known to stabilize amorphous calcium carbonate (ACC) and affect its crystallization pathways. However, little is known about the mechanisms behind these phenomena. Here it is shown that ACC is stabilized by pAsp molecules in the solution rather than by the amount of pAsp incorporated into the ACC bulk, and that the effect of pAsp on the polymorph selection is entirely different at low and high concentration of pAsp. At low concentrations, pAsp is more effective in inhibiting the nucleation and growth of vaterite than calcite. At high concentrations, when calcite formation is prevented, the crystallization of vaterite proceeds via a pseudomorphic transformation of ACC nanospheres, where vaterite nucleates on the surface of ACC nanospheres and grows by a local transformation of the bulk ACC phase. These results shed some light on the function of pAsp during an ACC-mediated biomineralization process and provide an explanation for the presence of metastable vaterite at conditions where calcite is thermodynamically favored.