Skip to Main content Skip to Navigation
Conference papers

Nucleation of nanocrystals in solution: confinement by the amorphous networks

Abstract : Recent advances show that nucleation of crystalline phases from dilute solutions often involves the formation of intermediate disordered states: clusters, droplets, amorphous nanoparticles, polymorphs etc [1]. It remains unclear how the intermediate states affect the predictions of the classical single-step nucleation theory, in terms of activation barrier, rate of nucleation, or critical cluster sizes. Progress is hampered by the difficulty to reach sufficient resolutions (<1nm, <<1s), without perturbing the metastable process. Here, we overcome this issue using in situ x-ray scattering, and report nucleation rates upon formation of different nanocrystals in solution (luminescent YVO4:Eu, magnetite Fe3O4), where an intermediate nanostructured amorphous network is evidenced [2,3]. We find how the amorphous precursor impedes nucleation at the nanometer scale, and limits the size of the nanocrystals. The clarification of the role of the intermediate nanostructure clarifies why the predicted nanocrystal sizes are overestimated by several orders of magnitude by classical theories.
Document type :
Conference papers
Complete list of metadatas

Cited literature [3 references]  Display  Hide  Download

https://hal-cea.archives-ouvertes.fr/cea-02329638
Contributor : Serge Palacin <>
Submitted on : Wednesday, October 23, 2019 - 4:10:18 PM
Last modification on : Friday, July 17, 2020 - 5:24:04 PM
Long-term archiving on: : Friday, January 24, 2020 - 8:07:13 PM

File

Carriere_Cristal2019.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : cea-02329638, version 1

Citation

Jens Baumgartner, Alexy Freitas, Blaise Fleury, Raj-Kumar Raamoorthy, Marie-Alexandra Neouze, et al.. Nucleation of nanocrystals in solution: confinement by the amorphous networks. Cristal 9 - 2019, May 2019, Nancy, France. ⟨cea-02329638⟩

Share

Metrics

Record views

70

Files downloads

32