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  4. Preparation of magnesium, cobalt and nickel ferrite nanoparticles from metal oxides using deep eutectic solvents
 
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2016
Journal Article
Title

Preparation of magnesium, cobalt and nickel ferrite nanoparticles from metal oxides using deep eutectic solvents

Abstract
Natural deep eutectic solvents (DESs) dissolve simple metal oxides and are used as a reaction medium to synthesize spinel-type ferrite nanoparticles MFe2O4 (M=Mg, Zn, Co, Ni). The best results for phase-pure spinel ferrites are obtained with the DES consisting of choline chloride (ChCl) and maleic acid. By employing DESs, the reactions proceed at much lower temperatures than usual for the respective solid-phase reactions of the metal oxides and at the same temperatures as synthesis with comparable calcination processes using metal salts. The method therefore reduces the overall required energy for the nanoparticle synthesis. Thermogravimetric analysis shows that the thermolysis process of the eutectic melts in air occurs in one major step. The phase-pure spinel-type ferrite particles are thoroughly characterized by X-ray diffraction, diffuse-reflectance UV/Vis spectroscopy, and scanning electron microscopy. The properties of the obtained nanoparticles are shown to be comparable to those obtained by other methods, illustrating the potential of natural DESs for processing metal oxides.
Author(s)
Söldner, Anika
Zach, Julia
Iwanow, Melanie  
Gärtner, Tobias  
Schlosser, Marc
Pfitzner, Arno
König, Burkhard
Journal
Chemistry. A European journal  
DOI
10.1002/chem.201602821
Language
English
Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik IGB  
Keyword(s)
  • deep eutectic solvents

  • ionic liquids

  • mixed metal oxides

  • nanoparticles

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