Scalable-manufactured randomized glass-polymer hybrid metamaterial for daytime radiative cooling
University of Colorado Boulder · University of Wyoming
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…
Citation impact
- FWCI
- 154.78
- Percentile
- 100%
- References
- 34
Authors
8Topics & keywords
- Radiative cooling
- Emissivity
- Materials science
- Metamaterial
- Infrared
- Radiant energy
- Optics
- Infrared window
- Affordable and clean energy