Preparation and Photothermal Conversion of h-BN/CuO Nanofluids

摘要

A new h-BN/CuO nanocomposite was prepared by using boron nitride(h-BN)and CuSO4 ·5H2O as raw materials via hydrothermal synthesis.We studied loading the CuO nanoparticles on sheet of h-BN substrate and the stability of the h-BN/CuO water-based(h-BN/CuO)nanofluids.It had both well light absorbing ability and photothermal conversion efficiency in direct absorption solar collectors(DASCs).The results show that different molar ratios of CuO to h-BN do not affect the size of CuO nanoparticles or h-BN substrates,but within a suitable feed ratio range,there exists an optimum feed ratio:h-BN/CuO 0.75:1 which the suspension stability is the best in the base fluid.Simultaneously,supporting CuO nanoparticles on h-BN substrate can make the absorption capacity of sunlight stronger than that of pure h-BN.Under the simulated sunlight source,the nanocomposite with feed ratio of 0.75:1 was selected for the photothermal conversion test.The highest photothermal temperature of 0.05 wt% h-BN/CuO nanofluid can reach 92.21 ℃,which is 37.58 ℃ higher than pure water at most.Meanwhile,compared with 35.35% for pure water,its photothermal conversion efficiency can rise to 80.18%.