Magnetically enhancing the Seebeck coefficient in ferrofluids
| Autor: | Michel Roger, G. Demouchy, Andrejs Cēbers, Sawako Nakamae, Régine Perzynski, M. Kouyaté, C. L. Filomeno, Marco Bonetti, Emmanuelle Dubois, Thomas J. Salez |
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| Rok vydání: | 2019 |
| Předmět: |
Ferrofluid
Materials science Condensed matter physics Physics::Medical Physics General Engineering Maghemite Bioengineering 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Magnetic field Physics::Fluid Dynamics Temperature gradient Nanofluid Seebeck coefficient engineering Magnetic nanoparticles General Materials Science 0210 nano-technology Concentration gradient |
| Zdroj: | Nanoscale Advances |
| ISSN: | 2516-0230 |
| Popis: | The influence of the magnetic field on the Seebeck coefficient (Se) was investigated in dilute magnetic nanofluids (ferrofluids) composed of maghemite magnetic nanoparticles dispersed in dimethyl-sulfoxide (DMSO). A 25% increase in the Se value was found when the external magnetic field was applied perpendicularly to the temperature gradient, reminiscent of an increase in the Soret coefficient (ST, concentration gradient) observed in the same fluids. In-depth analysis of experimental data, however, revealed that different mechanisms are responsible for the observed magneto-thermoelectric and -thermodiffusive phenomena. Possible physical and physico-chemical origins leading to the enhancement of the fluids' Seebeck coefficient are discussed. |
| Databáze: | OpenAIRE |
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