Overcoming the Inhibition Effects of Citrate: Precipitation of Ferromagnetic Magnetite Nanoparticles with Tunable Morphology, Magnetic Properties, and Surface Charge via Ferrous Citrate Oxidation,Particle & Particle Systems Characterization

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Overcoming the Inhibition Effects of Citrate: Precipitation of Ferromagnetic Magnetite Nanoparticles with Tunable Morphology, Magnetic Properties, and Surface Charge via Ferrous Citrate Oxidation
Particle & Particle Systems Characterization ( IF 2.7 ) Pub Date : 2021-06-26 , DOI: 10.1002/ppsc.202100098
Tim Granath _{1,

2} , Karl Mandel _{1,

3} , Peer Löbmann ₃

Affiliation

This study demonstrates how the method of thermally assisted oxidative precipitation in water can be opened for—the so far neglected—metal organic iron(II) complexes (herein: citrate) in order to obtain, in one step, ferromagnetic magnetite nanoparticles, possessing essential ligand properties. Based on a dedicated analysis of the specific precursor in combination with the consideration of known properties of the ligand, it is possible to identify existing inhibition-attributes of the iron organyl such that these can be overcome. Moreover, they can be exploited in a targeted manner; thus, simply by changing concentrations, a variety of magnetite nanoparticle morphologies with distinct properties can be obtained. In the case of the herein investigated ferrous citrate, three major inhibition effects are identified. While two of them efficiently prevent the formation of magnetite and need to be addressed to be overcome, the third can be exploited to selectively synthesize, for example, relatively stable carboxyl group-bearing nuclei clusters, exhibiting the properties of magnetically responsive photonic crystals, or relatively large mesocrystals, whose intraparticular magnetic interactions are apparently disturbed.

中文翻译：

克服柠檬酸盐的抑制作用：通过柠檬酸亚铁氧化沉淀具有可调形态、磁性和表面电荷的铁磁磁铁矿纳米颗粒

这项研究证明了如何在水中热辅助氧化沉淀的方法可以打开 - 迄今为止被忽视的 - 金属有机铁（II）配合物（此处：柠檬酸盐），以便一步获得铁磁性磁铁矿纳米粒子，具有必需的配体性质。基于对特定前体的专门分析并结合对配体已知特性的考虑，可以确定有机铁的现有抑制特性，从而可以克服这些抑制特性。此外，它们可以被有针对性地利用；因此，简单地通过改变浓度，可以获得具有不同性质的各种磁铁矿纳米颗粒形态。在本文研究的柠檬酸亚铁的情况下，确定了三种主要的抑制作用。

更新日期：2021-08-12

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