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Oxidative Precipitation as a Versatile Method to Obtain Ferromagnetic Fe\(_{3}\)O\(_{4}\) Nano‐ and Mesocrystals Adjustable in Morphology and Magnetic Properties

Please always quote using this URN: urn:nbn:de:bvb:20-opus-224419
  • Oxidative precipitation is a facile synthesis method to obtain ferromagnetic iron oxide nanoparticles from ferrous salts—with unexplored potential. The concentration of base and oxidant alone strongly affects the particle's structure and thus their magnetic properties despite the same material, magnetite (Fe\(_{3}\)O\(_{4}\)), is obtained when precipitated with potassium hydroxide (KOH) from ferrous sulfate (FeSO\(_{4}\)) and treated with potassium nitrate (KNO\(_{3}\)) at appropriate temperature. Depending on the potassium hydroxide andOxidative precipitation is a facile synthesis method to obtain ferromagnetic iron oxide nanoparticles from ferrous salts—with unexplored potential. The concentration of base and oxidant alone strongly affects the particle's structure and thus their magnetic properties despite the same material, magnetite (Fe\(_{3}\)O\(_{4}\)), is obtained when precipitated with potassium hydroxide (KOH) from ferrous sulfate (FeSO\(_{4}\)) and treated with potassium nitrate (KNO\(_{3}\)) at appropriate temperature. Depending on the potassium hydroxide and potassium nitrate concentrations, it is possible to obtain a series of different types of either single crystals or mesocrystals. The time‐dependent mesocrystal evolution can be revealed via electron microscopy and provides insights into the process of oriented attachment, yielding faceted particles, showing a facet‐dependent reactivity. It is found that it is the nitrate and hydroxide concentration that influences the ligand exchange process and thus the crystallization pathways. The presence of sulfate ions contributes to the mesocrystal evolution as well, as sulfate apparently hinders further crystal fusion, as revealed via infrared spectroscopy. Finally, it is found that nitrite, as one possible and ecologically highly relevant reduction product occurring in nature in context with iron, only evolves if the reaction is quantitative.show moreshow less

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Metadaten
Author: Tim Granath, Peer Löbmann, Karl Mandel
URN:urn:nbn:de:bvb:20-opus-224419
Document Type:Journal article
Faculties:Fakultät für Chemie und Pharmazie / Institut für Funktionsmaterialien und Biofabrikation
Language:English
Parent Title (English):Particle & Particle Systems Characterization
Year of Completion:2021
Volume:38
Issue:3
Article Number:2000307
Source:Particle & Particle Systems Characterization 2021, 38(3):2000307. DOI: 10.1002/ppsc.202000307
DOI:https://doi.org/10.1002/ppsc.202000307
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften
Tag:colloidal nanostructures; nanoparticle aggregation; non‐classical crystallization; oriented attachment
Release Date:2021/12/15
Licence (German):License LogoCC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International