| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Cashion, John
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (3/3 displayed)
- 2017Polypyridyl Iron Complex as a Hole-Transporting Material for Formamidinium Lead Bromide Perovskite Solar Cellscitations
- 2012Phase reduction of coated maghemite (γ-Fe2O3) nanoparticles under microwave-induced plasma heating for rapid heat treatmentcitations
- 2011Anion dependent redox changes in iron bis-terdentate nitroxide {NNO} chelatescitations
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article
Phase reduction of coated maghemite (γ-Fe2O3) nanoparticles under microwave-induced plasma heating for rapid heat treatment
Abstract
Microwave plasma heat treatment of iron oxide nanoparticles coated with conductive polymers (<i>e.g.</i>polypyrrole) is a simple method to produce highly electrically-conductive, magnetic nanoparticles, as the heat treatment induces conversion of the amorphous conductive polymeric material to a significantly more electrically-conductive graphitic structure. However, an undesirable side effect of such heat treatment is the decrease of magnetization of the iron oxide cores due to conversion to a non-magnetic phase. We report a facile route for rapid heat treatment of bare particles, silica coated, and silane coated iron oxide nanoparticles<i>via</i> plasma heating using a standard microwave oven. The initial phase of the iron oxide was maghemite (γ-Fe<sub>2</sub>O<sub>3</sub>) with a specific saturation magnetization (σ<sub>s</sub>) of 75 emu/g. Upon microwave heat treatment, the magnetization was reduced to 6 emu/g as they were converted almost entirely to hematite (α-Fe<sub>2</sub>O<sub>3</sub>) phase. Silica coated maghemite with σs of 48 emu/g was reduced to magnetite (Fe<sub>3</sub>O<sub>4</sub>) and fayalite (Fe<sub>2</sub>SiO<sub>4</sub>) with a σ<sub>s</sub> value of 34 emu/g. When the maghemite nanoparticles were coated with thin silane layers, the magnetization value increased to 86 emu/g after microwave treatment as the cores were converted to magnetite. The proposed method can thus be used to increase the crystallinity of the magnetic composites <i>via</i> rapid heat treatment, whilst preventing any adverse effects on magnetic properties.