不同形貌纳米氧化铜的合成及导热应用

纳米氧化铜(CuO)在传感器、催化及强化传热领域有优异的性能。以微生物法浸取的Cu~(2+)为铜源,通过改变溶液的pH制备不同形貌的纳米CuO,并对产物进行表征与分析。制备了以硅油为基体的含纳米CuO的纳米流体,并测试了其热导率。结果表明,纳米流体的热导率与添加CuO的体积分数基本呈线性关系。当添加相的体积分数为5%时,片状、梭子状和蒲公英状的CuO纳米流体热导率分别提高了12.3%、12.9%和29.0%。这说明CuO的形貌对复合体系的热导率有显著的影响,其中蒲公英状的纳米材料效果最佳。

Synthesis and Thermal Application of Copper Oxide Nanoparticles with Different Morphologies

Copper oxide (CuO) nanoparticles have excellent performance in the field of sensor, catalysis and heat transfer enhancement. Copper ions extracted by microbial leaching were used as the copper source and CuO nanoparticles with different morphologies were prepared by changing the pH of the solution, and the products were characterized and analyzed. The silicone based nanofluids containing CuO nanoparticles were prepared and their thermal conductivities were measured. The results show that the thermal conductivities of nanofluids have a nearly linear relationship with the volume fraction of CuO. When the additive volume fraction is 5%, the enhanced thermal conductivities for shapes of flake, shuttle and dandelion of CuO nanofluids are 12.3%, 12.9% and 29%, respectively. It demonstrates that the morphology of CuO has a significant effect on the thermal conductivity of the composite system and the dandelion-shaped nanomaterials have the optimal effect.