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"Non-classical” nucleation of oxide nanoparticles in solution: implications on structure control

Abstract : Crystallization from solution is commonly described by classical nucleation theory [1], although this ignores that crystals often form via disordered nanostructures [2]. As an alternative, the classical theory remains widely used in a “multi-step” variant, where the intermediate nanostructures merely introduce additional thermodynamic parameters [3]. But this variant still requires validation by experiments addressing indeed proper time and spatial scales (ms, nm). 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 [4]. We find that the self-confinement by an amorphous precursor slows down crystal growth by two orders of magnitude once the crystal size reaches the amorphous particle size (c.a. 3 nm). Thus, not only the thermodynamic properties of transient amorphous nanostructures, but also their spatial distribution determine crystal nucleation
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https://hal-cea.archives-ouvertes.fr/cea-03448985
Contributor : Serge Palacin Connect in order to contact the contributor
Submitted on : Thursday, November 25, 2021 - 2:40:07 PM
Last modification on : Saturday, November 27, 2021 - 3:43:06 AM

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  • HAL Id : cea-03448985, version 1

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Jens Baumgartner, Raj-Kumar Ramamoorthy, Alexy Freitas, Marie-Alexandra Néouze, Mathieu Bennet, et al.. "Non-classical” nucleation of oxide nanoparticles in solution: implications on structure control. C'Nano 2020: The Nanoscience Meeting, C'Nano, Nov 2021, Toulouse, France. ⟨cea-03448985⟩

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