Measurement of thermal diffusivity of gold nanofluid according to particle size and temperature
by Taesung Kim; HyunWoo Park; Teun-Teun Kim; Sok Won Kim
International Journal of Nanotechnology (IJNT), Vol. 19, No. 1, 2022

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.

Online publication date: Thu, 21-Apr-2022

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