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For the iron oxide nanoparticle synthesis, it allows an easy tuning of the nanoparticle's size, shape, and composition, which is often explained by the LaMer theory involving a clear separation between nucleation and growth steps. Here, the events before the nucleation of iron oxide nanocrystals are investigated by combining different complementary in situ characterization techniques. These characterizations are carried out not only on powdered iron stearate precursors but also on a preheated liquid reaction mixture. They reveal a new nucleation mechanism for the thermal decomposition method: instead of a homogeneous nucleation, the nucleation occurs within vesicle\u2010like\u2010nanoreactors confining the reactants. The different steps are: 1) the melting and coalescence of iron stearate particles, leading to \u201cdroplet\u2010shaped nanostructures\u201d acting as nanoreactors; 2) the formation of a hitherto unobserved iron stearate crystalline phase within the nucleation temperature range, simultaneously with stearate chains loss and Fe(III) to Fe(II) reduction; 3) the formation of iron oxide nuclei inside the nanoreactors, which are then ejected from them. This mechanism paves the way toward a better mastering of the metal oxide nanoparticles synthesis and the control of their properties.<\/jats:p>","DOI":"10.1002\/smll.202200414","type":"journal-article","created":{"date-parts":[[2022,4,15]],"date-time":"2022-04-15T09:01:11Z","timestamp":1650013271000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["A Confinement\u2010Driven Nucleation Mechanism of Metal Oxide Nanoparticles Obtained via Thermal Decomposition in Organic Media"],"prefix":"10.1002","volume":"18","author":[{"given":"Geoffrey","family":"Cotin","sequence":"first","affiliation":[{"name":"Universit\u00e9 de Strasbourg CNRS Institut de Physique et Chimie des Mat\u00e9riaux de Strasbourg  UMR 7504 Strasbourg F\u201067034 France"},{"name":"Labex CSC Fondation IcFRC\/Universit\u00e9 de Strasbourg  8 all\u00e9e Gaspard Monge BP 70028 Strasbourg Cedex F\u201067083 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