Spanish nanomaterial cools surfaces by 12.9°C without electricity
Passive Nanomaterial Pulls Surfaces 12.9°C Below Ambient Air — No Power Required
Poinews.com – Last summer, researchers stationed a freshly treated polymer sample on the rooftop of their Madrid-area facility and watched it outperform the surrounding air by nearly thirteen degrees Celsius on the most brutal days of the season. The result, confirmed under peak solar irradiance of 962 W/m² in Tres Cantos, validated a cooling strategy that requires neither a compressor nor a wall socket.
The Atmospheric Shortcut
The technique rests on a quirk of Earth's atmosphere: between 8 and 13 micrometres of the infrared spectrum, thermal radiation passes straight through to outer space without being reabsorbed. Any surface that radiates efficiently within that window while simultaneously bouncing back incoming sunlight will settle below ambient temperature. The approach, known as daytime passive radiative cooling, sidesteps the roughly 20% share of global electricity already consumed by mechanical cooling systems.
Choosing the Right Polymer
The team selected polyvinylidene fluoride (PVDF), a workhorse polymer long recognised for its infrared emissivity. Cristina Vicente, head of the COOLed project at the Institute of Micro and Nanotechnology (IMN-CNM, CSIC), describes why the choice proved decisive:
"brings together a combination of properties" that make it ideal
Beyond efficient heat emission, PVDF resists ultraviolet degradation, sheds water for a built-in self-cleaning effect, and endures prolonged outdoor exposure without significant performance loss.
Engineering at the Nanoscale
The critical innovation was not the polymer itself but the architecture imposed upon it. The researchers infiltrated PVDF into nanoporous templates of anodised aluminium oxide, producing three-dimensional microstructures whose internal geometry could be tuned with nanoscale precision. Because optical performance in these coolers is dictated by sub-micron design parameters, that geometric control proved indispensable.
Measured Performance
After ultrafast cooling treatment following polymer infiltration, the optimised structure reflected an average of 82.4% of incident solar radiation and emitted 96.7% of its thermal load within the 8–13 µm atmospheric window. Under standard solar irradiance of 1,000 W/m², the calculated cooling capacity reached 182.3 W/m² — a figure corroborated by the open-air trials in Tres Cantos, where the whitened, UV-treated surface held up to 12.9°C below an uncoated reference sample on the hottest, driest, sunniest days of the test period.
From Rooftop to Real-World Deployment
The work, led by the Functional Nanoscale Devices for Energy (FINDER) group and published in Nanophotonics, remains at a developmental stage. Nevertheless, the authors emphasise that the fabrication route is comparatively inexpensive and compatible with established industrial processes. That compatibility points toward a broad application spectrum: building façades and rooftops, electronic enclosures, vehicle panels, and even wearable personal-cooling systems — each aimed at trimming reliance on air conditioning and the associated carbon emissions.
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