Nano Archive

Thermal conductivity and thermal diffusivity of SiO2 nanopowder

Zheng, Xinghua and Qiu, Lin and Su, Guoping and Tang, Dawei and Liao, Yuchao and Chen, Yunfa (2011) Thermal conductivity and thermal diffusivity of SiO2 nanopowder. Journal of Nanoparticle Research, 13 (12). pp. 6887-6893.

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Abstract

A 3ω approach for the simultaneous determination of the effective thermal conductivity and thermal diffusivity of nanopowder materials was developed. A 3ω experimental system was established, and the thermal properties of water and alcohol were measured to validate and estimate the accuracy of the current experimental system. The effective thermal conductivity and thermal diffusivity of the SiO2 nanopowder with 375, 475, and 575 nm diameters were measured at 290–490 K and at different densities. At room temperature, the effective thermal conductivity and thermal diffusivity of the SiO2 nanopowder increased with temperature; however, both values decreased as the particle diameter was reduced. An optimum SiO2 powder density that decreased with decreasing diameter was also observed within the measurement range. The minimum effective thermal conductivity and maximum effective thermal diffusivity were obtained at 85 × 10−3 kg/L, when the particle diameter was 575 nm. The optimum densities of the particles with 375 and 475 nm diameters were less than 50.23 × 10−3 and 64.82 × 10−3 kg/L, respectively.

Item Type:Article
ID Code:11438
Deposited By:Prof. Alexey Ivanov
Deposited On:05 Jan 2012 09:29
Last Modified:05 Jan 2012 09:42

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