COURTESY OF THE RESEARCHERS
In the researchers’ prototype device, a half-square-meter panel of the hydrogel is enclosed in a glass chamber coated with a cooling polymer film. When the vapor captured by the textured material evaporates, the bubbles shrink down in an origami-like transformation. The vapor then condenses on the glass, where it can flow out through a tube.
The system runs entirely on its own, unlike other designs that require batteries, solar panels, or electricity from the grid. The team ran it for over a week in Death Valley, California—the driest place in North America. Even in those conditions, it squeezed clean water from the air at rates of up to 160 milliliters (about two-thirds of a cup) per day.
“We have built a meter-scale device that we hope to deploy in resource-limited regions, where even a solar cell is not very accessible,” says Professor Xuanhe Zhao, the senior author of a paper on the work. The team estimates that a small array of the panels could passively supply a household with drinking water even in a desert, with greater production in temperate and tropical climates.
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