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  Self-Confined Nucleation of Iron Oxide Nanoparticles in a Nanostructured Amorphous Precursor

Baumgartner, J., Ramamoorthy, R. K., Freitas, A. P., Neouze, M.-A., Bennet, M. A., Faivre, D., et al. (2020). Self-Confined Nucleation of Iron Oxide Nanoparticles in a Nanostructured Amorphous Precursor. Nano Letters, 20(7), 5001-5007. doi:10.1021/acs.nanolett.0c01125.

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 Creators:
Baumgartner, Jens1, Author              
Ramamoorthy, Raj Kumar, Author
Freitas, Alexy P., Author
Neouze, Marie-Alexandra, Author
Bennet, Mathieu A.1, Author              
Faivre, Damien1, Author              
Carriere, David, Author
Affiliations:
1Damien Faivre, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863290              

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Free keywords: Crystals, Iron, Crystallization, Nanoparticles, Nucleation
 Abstract: Crystallization from solution is commonly described by classical nucleation theory, although this ignores that crystals often form via disordered nanostructures. As an alternative, the classical theory remains widely used in a “multistep” variant, where the intermediate nanostructures merely introduce additional thermodynamic parameters. However, this variant still requires validation by experiments addressing indeed proper time and spatial scales (millisecond, nanometer). Here, we used in situ X-ray scattering to determine the mechanism of magnetite crystallization and, in particular, how nucleation propagates at the nanometer scale within amorphous precursors. We find that the self-confinement by an amorphous precursor slows down crystal growth by 2 orders of magnitude once the crystal size reaches the amorphous particle size (∼3 nm). Thus, not only the thermodynamic properties of transient amorphous nanostructures but also their spatial distribution determine crystal nucleation.

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Language(s): eng - English
 Dates: 2020-06-182020
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.1021/acs.nanolett.0c01125
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Title: Nano Letters
  Abbreviation : Nano Lett.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 20 (7) Sequence Number: - Start / End Page: 5001 - 5007 Identifier: ISSN: 1530-6984