Authors: M-H Chang, C.Y-D Tai
Affilation: National Taiwan University, Taiwan
Pages: 562 - 565
Keywords: spinning disk reactor, nanofluid, copper oxide, nanoparticle
The aim of this research was to synthesize copper oxide (CuO) nanoparticles, which were further applied to prepare CuO-water nanofluid, using a spinning disk reactor (SDR). The precursor of copper oxide was first synthesized by a liquid-liquid reaction of CuSO4 and Na2CO3 solutions in a continuous mode using SDR. Then the precursor was calcined up to 500oC to obtain copper oxide nanoparticles. The effects of operating variables, including rotation speed, reactant concentration, and liquid flow rate, on the size of copper oxide nanoparticles were investigated. Smaller copper oxide particles were obtained under lower reactant concentration and higher disk rotation speed. Spherical copper oxide nanoparticles with size 20~30 nm were observed under a field emission gun scanning electron microscope (FEG-SEM), as shown in Fig. 1. The particle size distribution shown in Fig. 2 with a volume mean size about 60-70 nm was measured by a dynamic light scattering analyzer. To prepare CuO-water nanofluid, sodium hexametaphosphate (NaHMP) was used as a dispersant. When CuO content was increased to 0.4 vol %, effective thermal conductivity of the CuO-water nanofluid can be improved by 10 %, which was more desirable than the results reported in the literature [1~3] as shown in Fig. 3.