Effective Radiative Cooling by Paint-Format Microsphere-Based Photonic Random Media
Effective Radiative Cooling by Paint-Format Microsphere-Based Photonic Random Media
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DOI：
10.1021/acsphotonics.7b01492
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发表时间：
2018-04-01
期刊：
影响因子：
7
通讯作者：
Han, Sang Eon
中科院分区：
文献类型：
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作者：
Atiganyanun, Sarun;Plumley, John B.;Han, Sang Eon
我们证明，当适当随机化以最小化光子传输平均自由程时，光子介质可用于涂覆黑色基板并通过辐射冷却降低其温度。即使在强烈的太阳辐射下，基板温度也可能大大低于周围空气的温度。我们的由二氧化硅微球组成的随机介质在白天冷却方面远远优于市售的太阳能反射白色涂料。我们通过对光散射的系统研究实现了出色的冷却性能，这表明最大散射的随机介质的结构参数与商用涂料的结构参数显着不同。我们创建了随机介质，以最大限度地提高太阳光谱中的光学散射并增强大气透明窗口中的热发射。与之前的研究相比，我们的随机介质不需要昂贵的处理步骤或材料（例如银），并且可以以油漆形式应用于几乎任何表面。我们的随机介质的简便且可扩展的处理步骤表明低成本涂层可用于高效辐射冷却的可能性。
We demonstrate that photonic media, when properly randomized to minimize the photon transport mean free path, can be used to coat a black substrate and reduce its temperature by radiative cooling. Even under strong solar radiation, the substrate temperature could reach substantially below that of the ambient air. Our random media that consist of silica microspheres considerably outperform commercially available solar-reflective white paint for daytime cooling. We have achieved the outstanding cooling performance through a systematic study on light scattering, which reveals that the structural parameters of the random media for maximum scattering are significantly different from those of the commercial paint. We have created the random media to maximize optical scattering in the solar spectrum and to enhance thermal emission in the atmospheric transparency window. In contrast to previous studies, our random media do not require expensive processing steps or materials, such as silver, and can be applied to almost any surface in a paint format. The facile and scalable processing steps for our random media point to the possibility that low-cost coatings can be used for efficient radiative cooling.