Details

Autor(en) / Beteiligte

• Zhai, Yao
• Ma, Yaoguang
• David, Sabrina N.
• Zhao, Dongliang
• Lou, Runnan
• Tan, Gang
• Yang, Ronggui
• Yin, Xiaobo

Titel

Scalable-manufactured randomized glass-polymer hybrid metamaterial for daytime radiative cooling

Ist Teil von

• Science (American Association for the Advancement of Science), 2017-03, Vol.355 (6329), p.1062-1066

Ort / Verlag

United States: American Association for the Advancement of Science

Erscheinungsjahr

2017

Quelle

American Association for the Advancement of Science

Beschreibungen/Notizen

• 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.