Science· 2017Q1
Scalable-manufactured randomized glass-polymer hybrid metamaterial for daytime radiative cooling
- 2,365citations
- Q1SCImago
- 2017year
Short summary
Researchers developed a novel glass-polymer hybrid metamaterial that achieves daytime radiative cooling by being transparent to solar radiation while strongly emitting infrared heat, demonstrating a cooling power of 93 W/m² under direct sunshine.
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Key points
- Metamaterial is transparent to solar spectrum and highly emissive (>0.93) in the atmospheric infrared window.
- Achieves a radiative cooling power of 93 W/m² under direct sunshine when backed with a silver coating.
- Demonstrated high-throughput, economical roll-to-roll manufacturing process for the material.
- Randomly embedded resonant polar dielectric microspheres in a polymer matrix form the hybrid structure.
AI-generated from the title and abstract; the full text is not read.
Abstract
Passive radiative cooling draws heat from surfaces and radiates it into space as infrared radiation to which the atmosphere is transparent. However, the energy density mismatch between solar irradiance and the low infrared radiation flux from a near-ambient-temperature surface requires materials that strongly emit thermal energy and barely absorb sunlight. We embedded resonant polar dielectric microspheres randomly in a polymeric matrix, resulting in a metamaterial that is fully transparent to the solar spectrum while having an infrared emissivity greater than 0.93 across the atmospheric window. When backed with a silver coating, the metamaterial shows a noontime radiative cooling power of 93 watts per square meter under direct sunshine. More critically, we demonstrated high-throughput, economical roll-to-roll manufacturing of the metamaterial, which is vital for promoting radiative cooling as a viable energy technology.
The authors' abstract, as published at the source. Science, 2017 · DOI ↗
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Field: Civil and Structural Engineering
Civil and Structural EngineeringEngineering