耐久性
对偶(语法数字)
比例(比率)
辐射传输
材料科学
辐射冷却
环境科学
机械工程
复合材料
工程类
物理
光学
艺术
热力学
文学类
量子力学
作者
Renwei Zhang,Ningning Sun,Zehong Zhao,Shixu Wang,M Zhang,Lei Zhao,Yahua Liu,Shile Feng
出处
期刊:Nanoscale horizons
[The Royal Society of Chemistry]
日期:2024-01-01
卷期号:9 (8): 1354-1363
摘要
Passive radiative cooling (PRC), as an energy-free cooling approach, is ingeniously harnessed for certain natural organisms to withstand extreme high-temperature climates, which has inspired numerous bionic designs. However, it is a great challenge to enhance the durability of the designed materials in practical scenarios while inheriting the natural biological principles. We demonstrate bionic dual-scale structured (BDSS) films for efficient passive radiative cooling accompanied by robust durability after discovering the excellent thermoregulatory properties of the inner surface of Hawaiian scallop shell. We found that the inner surface of the shell consists of large-scale triangular ridges scattered with small-scale terrace steps. This dual-scale structure can enhance the reflectivity of sunlight by efficient Mie scattering and increase the emissivity in the mid-infrared range by lengthening the propagation of photons, thereby decreasing the surface temperature. Underpinned by this finding, we developed a BDSS film that features a strong solar spectrum reflectivity of 0.95 and a high mid-infrared emissivity of 0.98, achieving a sub-ambient cooling of 10.8 °C under direct sunlight. Additionally, the designed films possess robust durability including excellent self-cleaning, flexibility, mechanical strength, chemical stability, and anti-ultraviolet radiation, which is promising for thermal thermoregulation in various harsh scenarios.
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