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Molecular-Level Understanding of Continuous Growth from Iron-Oxo Clusters to Iron Oxide Nanoparticles.

08:00 EDT 9th April 2019 | BioPortfolio

Summary of "Molecular-Level Understanding of Continuous Growth from Iron-Oxo Clusters to Iron Oxide Nanoparticles."

The formation of inorganic nanoparticles has been understood based on the classical crystallization theory described by a burst of nucleation, where surface energy is known to play a critical role, and diffusion-controlled growth process. However, this nucleation and growth model may not be universally applicable to the entire nanoparticle systems because different precursors and surface ligands are used during their synthesis. Their intrinsic chemical reactivity can lead to a formation pathway that deviates from classical nucleation and growth model. The formation of metal oxide nanoparticles is one such case, because of several distinct chemical aspects during their synthesis. Typical carboxylate surface ligands, which are of-ten employed in the synthesis of oxide nanoparticles, tend to continuously remain on the surface of the nanoparticles throughout the growth process. They can also act as an oxygen source during the growth of metal oxide nanoparticles. Car-boxylates are prone to chemical reactions with different chemical species in the synthesis such as alcohol or amine. Such reactions can frequently leave reactive hydroxyl groups on the surface. Herein, we track the entire growth process of iron oxide nanoparticles synthesized from conventional iron precursors, iron-oleate complexes, with strongly chelating carbox-ylate moieties. Mass spectrometry studies reveal that the iron-oleate precursor is a cluster comprising a tri-iron-oxo core and carboxylate ligands, rather than a mononuclear complex. A combinatorial analysis presents that the entire growth, regulated by organic reactions of chelating ligands, is continuous without a discrete nucleation step.

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This article was published in the following journal.

Name: Journal of the American Chemical Society
ISSN: 1520-5126
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