Thermal diffusivity of ferrofluids as a function of particle size determined using the mode-mismatched dual-beam thermal lens technique
| Autor: | V. M. Lenart, Rozane de Fátima Turchiello, Gerardo F. Goya, S. L. Gómez, Nelson G. C. Astrath |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Ferrofluid Materials science Number density Condensed matter physics Physics::Medical Physics Relaxation (NMR) Physics::Optics General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology Thermal diffusivity 01 natural sciences Thermal conductivity 0103 physical sciences Magnetic nanoparticles Particle size 0210 nano-technology Superparamagnetism |
| Zdroj: | Journal of Applied Physics. 123:085107 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.5017025 |
| Popis: | Ferrofluids are colloids of superparamagnetic nanoparticles that are envisaged for use in hyperthermia, which is based on nonradiative relaxation after interaction with a high-frequency magnetic field or light. For such applications, an important parameter is the thermal diffusivity. In this communication, we present an experimental study of the dependence of thermal diffusivity of ferrofluids on the size of the magnetite nanoparticles by employing the mode-mismatched thermal lens technique. The results show a huge enhancement of the thermal diffusivity by increasing the average size of the nanoparticles, while the number density of the nanoparticles is maintained as constant. |
| Databáze: | OpenAIRE |
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