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A newly developed groundbreaking chalk-based fabric that promises to significantly enhance comfort during outdoor activities, particularly in the summer heat. Created by scientists at the University of Massachusetts Amherst, this innovative fabric features a mineral-polymer coating that can cool the air beneath it by up to 5 degrees Celsius.
This new cooling fabric is particularly useful for anyone spending time outdoors in hot weather—athletes, landscapers, and even soldiers during training exercises. The fabric’s unique cooling properties arise from its ability to block sunlight and release body heat through a process known as radiative cooling. Traditional fabrics often absorb UV and near-infrared light from the sun, which increases their temperature and the heat experienced by the wearer. The new fabric addresses this by incorporating a coating made from natural minerals.
The coating is a blend of calcium carbonate and barium sulfate, both of which are derived from common chalk. Calcium carbonate reflects visible and near-infrared light, while barium sulfate is effective at reflecting ultraviolet light. Researchers developed a simple, eco-friendly method to apply this coating to fabrics, creating a chalky, matte finish that enhances cooling efficiency. They do this by first coating small fabric squares with a polymer layer, then repeatedly dipping them in solutions that contain calcium or barium ions, along with carbonate or sulfate ions, according to Interesting Engineering.
Testing has shown that this treated fabric can lower temperatures by as much as 5 degrees Celsius compared to untreated fabrics under direct sunlight, with a maximum difference of 8 degrees Celsius in some cases. This cooling effect could be especially valuable for soldiers in training, who often face extreme temperatures in the field. By using this fabric in uniforms or gear, soldiers can experience a significant reduction in heat stress, improving their comfort and performance during rigorous activities.
The coating’s durability is another key advantage. It has proven to withstand washing and drying, maintaining its cooling properties over time. The researchers are currently exploring commercial production options, which could bring this innovative cooling technology to a wider audience.
Trisha L. Andrew, a chemist involved in the research, highlights the fabric’s potential: “Without any power input, we’re able to reduce how hot a person feels, which could be a valuable resource where people are struggling to stay cool in extremely hot environments.”
The findings will be presented at the fall meeting of the American Chemical Society (ACS).
