Sydney: Scientists in Australia have developed an innovative nanoengineered polymer paint-like coating that passively cools buildings and captures water directly from the air without requiring any energy input. This groundbreaking invention, created by researchers at the University of Sydney in collaboration with start-up Dewpoint Innovations, has the potential to address global water scarcity and reduce the need for energy-intensive cooling systems.
According to Namibia Press Agency, the research team engineered a porous polymer coating that can reflect up to 97 percent of sunlight and radiate heat into the air. This allows surfaces coated with the material to remain up to six degrees cooler than the surrounding air, even when exposed to direct sunlight. The cooling effect creates ideal conditions for atmospheric water vapor to condense into droplets on the cooler surface, similar to how steam condenses on a bathroom mirror.
Professor Chiara Neto from the University of Sydney Nano Institute and School of Chemistry highlighted the significance of this technology, stating that it not only advances the science of cool roof coatings but also provides a sustainable, low-cost, and decentralized source of fresh water. This development is crucial in the context of climate change and increasing water scarcity.
During a six-month outdoor study conducted on the Sydney Nanoscience Hub rooftop, the coating demonstrated its efficacy by collecting dew over 32 percent of the year. It was able to harvest up to 390 ml of water per square meter daily, which is sufficient to meet the daily drinking needs of one person for a 12-square-meter surface.
The polymer coating sets itself apart from traditional white paints by relying on its internal porous structure, rather than ultraviolet-reflective pigments like titanium dioxide. This enhances its durability and reduces glare. The study detailing these findings was published in Advanced Functional Materials. Professor Neto emphasized the transformative potential of the technology, envisioning roofs that not only stay cooler but also generate their own fresh water.