The nanorings act as microscopic antennas for near-infrared (NIR) radiation, which carries most of the Sun's heat. When exposed to intense sunlight, they warm up through a thermoplasmonic process that reduces NIR transmission. Because this mechanism is directly driven by light, the coating self-regulates - stronger sunlight triggers stronger reflection of heat, while lower light reduces the effect.
Unlike electrochromic or mechanically controlled systems, the material functions entirely passively. It requires no sensors, wiring, or external power, yet maintains high visible light transmission, allowing buildings to stay bright without excessive heat gain. The effect is fully reversible and has been confirmed in controlled laboratory experiments.
Researchers note that buildings with extensive glazing often spend more energy on cooling than heating. A passive window layer that selectively blocks heat-producing radiation during peak sunlight could reduce cooling loads, carbon emissions, and overall energy consumption while improving indoor comfort.
Research Report:Thermoplasmonic Nanorings for Passive Solar-Responsive Smart Windows in Energy-Efficient Building Applications
Related Links
iNANO, Aarhus University
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