Magnetic and Optical Properties of Isolated and Aggregated CoFe2O4 Superparamagnetic Nanoparticles Studied by MCD Spectroscopy
| Autor: | Finn Purcell-Milton, Yurii K. Gun'ko, Mikhail A. Baranov, Anatoly V. Fedorov, Raquel Serrano-García, Yulia A. Gromova, Alexander V. Baranov, Vera Kuznetsova, Vladimir G. Maslov |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Magnetic circular dichroism Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Signal 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Magnetization Colloid General Energy Nuclear magnetic resonance Physical and Theoretical Chemistry 0210 nano-technology Spectroscopy Order of magnitude Superparamagnetism |
| Zdroj: | The Journal of Physical Chemistry C. 122:11491-11497 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Magnetic, optical, and structural properties of superparamagnetic CoFe2O4 nanoparticles (MNPs), both isolated and in aggregates, are investigated by magnetic circular dichroism (MCD) spectroscopy. The MCD signal for MNPs is more than an order of magnitude greater than the signal for organic molecules, therefore making this technique a very sensitive tool for the examination of MNP properties. MNP aggregation had a distinct effect upon the MCD signal intensity. Correlation between MCD signal intensity and MNP magnetization shows that MNP aggregation in colloidal solutions results in the changing of MNP magnetization with a maximum at the mean aggregate size of approximately 100 nm. |
| Databáze: | OpenAIRE |
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