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Hiking gear fabric could keep wearable devices cool

The fabric has heat-conducting properties on par with stainless steel, researchers report. As smartwatches become more powerful, they will generate more heat. To prevent burns or rashes, what if a material touching the skin could feel as cool as metal, but also be flexible enough to be worn on the wrist? The hiking gear material is made of ultra-high molecular weight polyethylene fibers, which are sold commercially under the brand name Dyneema. These polymer-based fabrics are marketed for their high strength, durability, and abrasion resistance. They are often used to create body armor, specialty sports gear, ropes, and nets. Heat transfer researchers recently investigated other uses for the fabric, namely as a cooling interface between human skin and wearable electronics. Their research is published in

Ultra-White Paint Reflects Heat and Cools Houses All Year Round

Jarrod Reedie A team of engineers at Indiana’s Purdue University have created an “ultra-white” paint that is capable of reflecting up to 98.1% of sunlight, that could potentially negate the need for air conditioning and even reduce carbon emissions if used on a mass scale. Developed as part of a six-year project, the researchers say that if the paint covered a 93sqm roof area it would be able to create a cooling power to ten kilowatts, far more powerful than domestic air conditioners.  The paint is made with a chemical compound called barium sulfate, that is used within cosmetics and photo paper to make them white. The barium sulfate particles are made up of different sizes which scatter sunrays and are able to cool immediate surrounding surfaces. The size of the particle determines how much light it scatters, so a wider range of particle sizes allows the paint to scatter more of the light spectrum from the sun.

Whitest paint ever made is also the coolest

In an effort to curb global warming, engineers have created the whitest paint ever made. Coating buildings with this paint may one day cool them off enough to reduce the need for air conditioning, the researchers say. In October, the team created an ultra-white paint that pushed limits on how white paint can be. Now they’ve outdone that. Not only is the new paint whiter, it can also can keep surfaces cooler than the formulation the researchers had previously demonstrated. “If you were to use this paint to cover a roof area of about 1,000 square feet, we estimate that you could get a cooling power of 10 kilowatts. That’s more powerful than the central air conditioners used by most houses,” says Xiulin Ruan, professor of mechanical engineering at Purdue University.

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