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Thermo-optical properties of silver and gold nanofluids |
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| Authors: | Lyane M. Moreira E. A. Carvalho M. J. V. Bell V. Anjos A. C. Sant’Ana Ana Paula P. Alves B. Fragneaud L. A. Sena B. S. Archanjo C. A. Achete |
| Affiliation: | 1. Laboratório de Espectroscopia de Materiais, Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Juiz de Fora, Juiz de Fora, Minas Gerais, 36036-330, Brazil 2. Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Juiz de Fora, Juiz de Fora, Minas Gerais, 36036-330, Brazil 3. Divis?o de Metrologia de Materiais (DIMAT), Instituto Nacional de Metrologia, Normaliza??o e Qualidade Industrial, Av. N. Sra. das Gra?as 50, Xerém, Duque de Caxias, Rio de Janeiro, 25250-020, Brazil 4. Engenharia Metalúrgica e de Materiais, Universidade Federal do Rio de Janeiro, Cx. Postal 68505, Rio de Janeiro, Rio de Janeiro, 21945-970, Brazil |
| Abstract: | This work focuses on the study of thermal diffusivity and physical properties of nanofluids with very low concentrations of silver or gold nanoparticles. Thermal measurements were performed by means of thermal lens spectroscopy in the dual beam configuration. Improvements of 20 and 16 % in the thermal diffusivity were observed for silver and gold nanofluids, respectively, in comparison with pure water. The estimation of the size distribution of the metallic nanoparticles was obtained through the fitting of the extinction spectra via Mie theory and images of field emission gun scanning electron microscopy. |
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