Title: Measurement of thermal diffusivity of gold nanofluid according to particle size and temperature

Authors: Taesung Kim; HyunWoo Park; Teun-Teun Kim; Sok Won Kim

Addresses: Department of Physics, University of Ulsan, Ulsan 44610, South Korea ' Department of Physics, University of Ulsan, Ulsan 44610, South Korea ' Department of Physics, University of Ulsan, Ulsan 44610, South Korea ' Department of Physics, University of Ulsan, Ulsan 44610, South Korea

Abstract: The thermal diffusivity of a gold nanofluid containing 20, 40, or 80 nm particles prepared by dispersing gold nanoparticles in ethylene glycol was measured from room temperature to 80°C using the thermal lens effect in dual laser beam mode consisting of an excitation laser (532 nm) and a probe laser (633 nm). Three samples with three different nanoparticle sizes were prepared at the same concentration (3 × 10^-5 wt.%). The thermal diffusivity was 1.020 × 10^-7 m²/s (20 nm), 1.379 × 10^-7 m²/s (40 nm), and 2.126 × 10^-7 m²/s (80 nm) at RT, and 1.211 × 10^-7 m²/s (20 nm), 1.784 × 10^-7 m²/s (40 nm), and 2.758 × 10^-7 m²/s (80 nm) at 80°C. Overall, the thermal diffusivity of a gold nanofluid was proportional to the nanoparticle size and increased with increasing temperature.

Keywords: thermal lens effect; gold nanoparticle; nanofluid; thermal diffusivity; thermo-optics; contactless method; real time measurement; dual-beam.

DOI: 10.1504/IJNT.2022.122367

International Journal of Nanotechnology, 2022 Vol.19 No.1, pp.50 - 57

Published online: 21 Apr 2022 *

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