Science
Prof. Xuanhe Zhao and his colleagues have developed an atmospheric water harvester to produce safe drinking water, reports Robert F. Service for Science. “The team sandwiched the hydrogel, which contains lithium-chloride salt, between two glass sheets,” explains Service. “At night, water vapor enters the gel and is trapped by the salts. During the day, sunlight heats the gel, evaporating the water. The vapor condenses on the glass panels, forming droplets that trickle down and are captured.”