Effective Radiative Cooling by Paint-Format Microsphere-Based Photonic Random Media
| Autor: | Kevin Hsu, Sarun Atiganyanun, Jacob Cytrynbaum, Sang Eon Han, Thomas L. Peng, Seok Jun Han, John B. Plumley, Sang M. Han |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Photon Radiative cooling business.industry Mean free path Scattering 020209 energy 02 engineering and technology Substrate (electronics) Radiation 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Light scattering Electronic Optical and Magnetic Materials 0202 electrical engineering electronic engineering information engineering Optoelectronics Electrical and Electronic Engineering Photonics 0210 nano-technology business Biotechnology |
| Zdroj: | ACS Photonics. 5:1181-1187 |
| ISSN: | 2330-4022 |
| DOI: | 10.1021/acsphotonics.7b01492 |
| Popis: | 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 ... |
| Databáze: | OpenAIRE |
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