用于白色反射器上结构色辐射冷却的折射率匹配空心二氧化硅胶体晶体
Index-matched hollow silica colloidal crystals for structurally colored radiative cooling on white reflectors
中文简介
尽管基于反射的结构色辐射冷却器具有较低的太阳光吸收率,但其高光学透过率需要使用白色反射器,而白色反射器的宽带背反射会导致严重的色差。本文报道了一种折射率匹配的空心二氧化硅(SiO₂)材料。2胶体晶体(CCs)能够从材料层面抑制这种冲刷现象,从而在白色聚四氟乙烯反射器上实现柔和色调的辐射冷却器。对传统固体和反相SiO₂进行了比较分析。2CCs 揭示了布拉格反射空心 SiO2CCs会在透射光到达反射器之前对其进行散射,从而产生光谱相关的内部散射背景,这种背景能够保持结构色,这与基底背反射导致色调褪色的情况截然不同。重要的是,聚二甲基硅氧烷的渗透对于抑制裸露空心SiO₂的过度散射至关重要。2通过折射率匹配实现CCs,从而恢复布拉格反射响应。两种具有不同粒径和壳层厚度的光子冷却器呈现出柔和的绿色和橙色色调,同时保持了较高的红外发射率。与颜色匹配的商用涂料相比,它们在中午时分可降低约8℃的温度,冷却功率分别提高112
英文摘要(原文)
Although reflection-based structurally colored radiative coolers offer low solar absorption, their high optical transmittance necessitates white reflectors, whose broadband back-reflection causes severe chromatic wash-out. Here, we report refractive-index-matched hollow SiO2 colloidal crystals (CCs) that suppress this wash-out at the material level, enabling pastel-colored radiative coolers on white
题录(GB/T 7714)
Kim M, Kim M J, Eum Y, 等. Index-matched hollow silica colloidal crystals for structurally colored radiative cooling on white reflectors[J]. Nano Energy, 2026, 158: 112342. DOI: 10.1016/j.nanoen.2026.112342.
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