Bertuit Enzo, Menguy Nicolas, Wilhelm Claire, Rollet Anne-Laure, Abou-Hassan Ali
Sorbonne Université, UMR CNRS 8234, PHysico-chimie des Électrolytes et Nanosystèmes InterfaciauX (PHENIX), F-75005, Paris, France.
Sorbonne Université, UMR 7590 CNRS-Sorbonne Université-IRD-MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Case 115, 4 Place Jussieu, 75252 Cedex 5, Paris, France.
Commun Chem. 2022 Dec 2;5(1):164. doi: 10.1038/s42004-022-00787-0.
Oriented attachment of nanobricks into hierarchical multi-scale structures such as inorganic nanoclusters is one of the crystallization mechanisms that has revolutionized the field of nano and materials science. Herein, we show that the mosaicity, which measures the misalignment of crystal plane orientation between the nanobricks, governs their magneto-optical properties as well as the magnetic heating functions of iron oxide nanoclusters. Thanks to high-temperature and time-resolved millifluidic, we were able to isolate and characterize (structure, properties, function) the different intermediates involved in the diverse steps of the nanocluster's formation, to propose a detailed dynamical mechanism of their formation and establish a clear correlation between changes in mosaicity at the nanoscale and their resulting physical properties. Finally, we demonstrate that their magneto-optical properties can be described using simple molecular theories.
纳米砖定向附着形成无机纳米团簇等分级多尺度结构是一种彻底改变纳米和材料科学领域的结晶机制。在此，我们表明，衡量纳米砖之间晶面取向失准程度的镶嵌性，决定了它们的磁光性质以及氧化铁纳米团簇的磁热功能。借助高温和时间分辨微流体技术，我们能够分离并表征（结构、性质、功能）纳米团簇形成不同步骤中涉及的不同中间体，提出其形成的详细动力学机制，并在纳米尺度上镶嵌性的变化与其产生的物理性质之间建立明确的关联。最后，我们证明可以用简单的分子理论来描述它们的磁光性质。
