Nonmetallic metasurfaces cut radiant heat transfer by 80%
New nonmetallic coatings developed by CUNY and Honeywell reduce thermal radiation between surfaces, offering improved insulation for electronics and space tech.
Researchers at the CUNY Graduate Center's Advanced Science Research Center and Honeywell Aerospace have developed a new method to reduce radiant heat transfer between closely spaced objects using nonmetallic metasurfaces. The thin coatings, tested in laboratory conditions, reduced thermal radiation emission by over 80% compared to conventional dielectric materials. The system maintained effectiveness across a wide temperature range and showed resilience to minor design and fabrication variations.
The approach involves pairing two thin, nonmetallic coatings to minimize heat exchange. Instead of focusing on a single surface’s ability to reflect infrared light, the team designed the surfaces to work together. One surface emits infrared radiation at specific wavelengths, while the other is engineered to absorb less of that radiation, effectively reducing heat transfer.
The technology, detailed in a study published in Nature Communications, could enhance thermal management in electronic devices, infrared sensors, and spacecraft components. Traditional metallic coatings, while effective at reflecting infrared light, can interfere with sensitive systems and are difficult to integrate with other materials. Nonmetallic alternatives have previously faced limitations in either narrow wavelength blocking or excessive thickness, but the new method overcomes these issues with a layered design that can be produced using standard thin-film techniques.
This breakthrough advances additive manufacturing and thermal management by offering a compact, nonmetallic solution for controlling heat transfer. The design could be particularly valuable in aerospace applications, where lightweight, durable, and non-conductive materials are essential. By enabling efficient thermal insulation without the drawbacks of metal, the technology supports broader goals of improving energy efficiency and system reliability in advanced manufacturing.
Edited by the news editor with AI from the original report — please refer to the original source.