材料科学
吸收(声学)
纳米流体
表面粗糙度
光热治疗
纳米颗粒
表面等离子共振
复合数
太阳能电池
太阳能
光学
表面光洁度
纳米技术
复合材料
光电子学
生态学
生物
物理
作者
Han Gong,Xiaoteng Ma,Shengnan Meng,Zheng Cui
标识
DOI:10.1016/j.optlastec.2023.110209
摘要
The photothermal utilization of solar energy is significant in promoting the transition towards more sustainable energy consumption patterns. Direct absorption solar collector (DASC) plays an important role as the main way of solar energy photothermal utilization. The application of nanofluids in DASC is critical. Previous studies commonly make the assumption that nanoparticles possess an ideal, smooth surface. However, in actuality, the surfaces of nanoparticles tend to exhibit random roughness. In this study, composite nanoparticles with randomly rough surfaces (CNRSs) are modeled, and their photothermal properties are investigated by numerical simulations. First, on the premise of verifying that CNRSs have good surface roughness randomness, it is found that the rough height (a) causes the “red shift” of the absorption peak. At the same time, the spectral absorption performance Qabs decreases by 14.79 % when a = 30. The mechanism affecting the absorption is analyzed through the electric field distribution, which is attributed to the local surface plasmon resonance (LSPR). Further, the increase in the number of rough spots (b) results in a slight decrease in the absorption performance of CNRSs. When the value of b is set to 4000, the spectral absorption performance of CNRSs exhibits a decrease of 3.97 % in comparison to that of smooth nanoparticles. Finally, it is found that the material and size of nanoparticles are very sensitive to the surface roughness.
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