Cargando…

Energetic Electron-Assisted Synthesis of Tailored Magnetite (Fe(3)O(4)) and Maghemite (γ−Fe(2)O(3)) Nanoparticles: Structure and Magnetic Properties

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,...

Descripción completa

Detalles Bibliográficos
Autores principales: Dietrich, Johannes, Enke, Alexius, Wilharm, Nils, Konieczny, Robert, Lotnyk, Andriy, Anders, André, Mayr, Stefan G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10005483/
https://www.ncbi.nlm.nih.gov/pubmed/36903665
http://dx.doi.org/10.3390/nano13050786
_version_ 1784905092195942400
author Dietrich, Johannes
Enke, Alexius
Wilharm, Nils
Konieczny, Robert
Lotnyk, Andriy
Anders, André
Mayr, Stefan G.
author_facet Dietrich, Johannes
Enke, Alexius
Wilharm, Nils
Konieczny, Robert
Lotnyk, Andriy
Anders, André
Mayr, Stefan G.
author_sort Dietrich, Johannes
collection PubMed
description 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.
format Online
Article
Text
id pubmed-10005483
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-100054832023-03-11 Energetic Electron-Assisted Synthesis of Tailored Magnetite (Fe(3)O(4)) and Maghemite (γ−Fe(2)O(3)) Nanoparticles: Structure and Magnetic Properties Dietrich, Johannes Enke, Alexius Wilharm, Nils Konieczny, Robert Lotnyk, Andriy Anders, André Mayr, Stefan G. Nanomaterials (Basel) Article 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. MDPI 2023-02-21 /pmc/articles/PMC10005483/ /pubmed/36903665 http://dx.doi.org/10.3390/nano13050786 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/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/).
spellingShingle Article
Dietrich, Johannes
Enke, Alexius
Wilharm, Nils
Konieczny, Robert
Lotnyk, Andriy
Anders, André
Mayr, Stefan G.
Energetic Electron-Assisted Synthesis of Tailored Magnetite (Fe(3)O(4)) and Maghemite (γ−Fe(2)O(3)) Nanoparticles: Structure and Magnetic Properties
title Energetic Electron-Assisted Synthesis of Tailored Magnetite (Fe(3)O(4)) and Maghemite (γ−Fe(2)O(3)) Nanoparticles: Structure and Magnetic Properties
title_full Energetic Electron-Assisted Synthesis of Tailored Magnetite (Fe(3)O(4)) and Maghemite (γ−Fe(2)O(3)) Nanoparticles: Structure and Magnetic Properties
title_fullStr Energetic Electron-Assisted Synthesis of Tailored Magnetite (Fe(3)O(4)) and Maghemite (γ−Fe(2)O(3)) Nanoparticles: Structure and Magnetic Properties
title_full_unstemmed Energetic Electron-Assisted Synthesis of Tailored Magnetite (Fe(3)O(4)) and Maghemite (γ−Fe(2)O(3)) Nanoparticles: Structure and Magnetic Properties
title_short Energetic Electron-Assisted Synthesis of Tailored Magnetite (Fe(3)O(4)) and Maghemite (γ−Fe(2)O(3)) Nanoparticles: Structure and Magnetic Properties
title_sort energetic electron-assisted synthesis of tailored magnetite (fe(3)o(4)) and maghemite (γ−fe(2)o(3)) nanoparticles: structure and magnetic properties
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10005483/
https://www.ncbi.nlm.nih.gov/pubmed/36903665
http://dx.doi.org/10.3390/nano13050786
work_keys_str_mv AT dietrichjohannes energeticelectronassistedsynthesisoftailoredmagnetitefe3o4andmaghemitegfe2o3nanoparticlesstructureandmagneticproperties
AT enkealexius energeticelectronassistedsynthesisoftailoredmagnetitefe3o4andmaghemitegfe2o3nanoparticlesstructureandmagneticproperties
AT wilharmnils energeticelectronassistedsynthesisoftailoredmagnetitefe3o4andmaghemitegfe2o3nanoparticlesstructureandmagneticproperties
AT koniecznyrobert energeticelectronassistedsynthesisoftailoredmagnetitefe3o4andmaghemitegfe2o3nanoparticlesstructureandmagneticproperties
AT lotnykandriy energeticelectronassistedsynthesisoftailoredmagnetitefe3o4andmaghemitegfe2o3nanoparticlesstructureandmagneticproperties
AT andersandre energeticelectronassistedsynthesisoftailoredmagnetitefe3o4andmaghemitegfe2o3nanoparticlesstructureandmagneticproperties
AT mayrstefang energeticelectronassistedsynthesisoftailoredmagnetitefe3o4andmaghemitegfe2o3nanoparticlesstructureandmagneticproperties