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Energetic Electron-Assisted Synthesis of Tailored Magnetite (Fe3O4) and Maghemite (γ-Fe2O3) Nanoparticles: Structure and Magnetic Properties.
| Content Provider | Europe PMC |
|---|---|
| Author | Dietrich, Johannes Enke, Alexius Wilharm, Nils Konieczny, Robert Lotnyk, Andriy Anders, André Mayr, Stefan G. |
| Editor | Faivre, Damien |
| Copyright Year | 2023 |
| Abstract | Iron oxide nanoparticles with a mean size of approximately 5 nm were synthesized by irradiating micro-emulsions containing iron salts with energetic electrons. The properties of the nanoparticles were investigated using scanning electron microscopy, high-resolution transmission electron microscopy, selective area diffraction and vibrating sample magnetometry. It was found that formation of superparamagnetic nanoparticles begins at a dose of 50 kGy, though these particles show low crystallinity, and a higher portion is amorphous. With increasing doses, an increasing crystallinity and yield could be observed, which is reflected in an increasing saturation magnetization. The blocking temperature and effective anisotropy constant were determined via zero-field cooling and field cooling measurements. The particles tend to form clusters with a size of 34 nm to 73 nm. Magnetite/maghemite nanoparticles could be identified via selective area electron diffraction patterns. Additionally, goethite nanowires could be observed. |
| Journal | Nanomaterials (Basel, Switzerland) |
| Volume Number | 13 |
| PubMed Central reference number | PMC10005483 |
| Issue Number | 5 |
| PubMed reference number | 36903665 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano13050786 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2023-02-21 |
| Access Restriction | Open |
| Rights License | Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). © 2023 by the authors. |
| Subject Keyword | nanoparticles electron beam irradiation magnetic properties magnetite maghemite microemulsion |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemical Engineering Materials Science |
