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  Control of polymorph selection in amorphous calcium carbonate crystallization by poly(aspartic acid) : two different mechanisms

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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-F21F-E Version Permalink: http://hdl.handle.net/21.11116/0000-0004-7D91-C
Genre: Journal Article

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 Creators:
Zou, Zhaoyong1, Author              
Bertinetti, Luca2, Author              
Politi, Yael3, Author              
Fratzl, Peter4, Author              
Habraken, Wouter1, Author              
Affiliations:
1Wouter Habraken (Indep. Res.), Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2231638              
2Luca Bertinetti (Indep. Res.), Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2231637              
3Yael Politi, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863297              
4Peter Fratzl, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863294              

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Free keywords: amorphous, aspartic acid, calcium carbonate, nanospheres, pseudomorphic transformation
 Abstract: 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.

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 Dates: 2017-04-052017-06-06
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/smll.201603100
PMID: 0528
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Project name : DIP
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Funding organization : DFG

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Title: Small
  Other : Small
Source Genre: Journal
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Publ. Info: Weinheim, Germany : Wiley
Pages: - Volume / Issue: 13 (21) Sequence Number: 1603100 Start / End Page: - Identifier: ISSN: 1613-6810