Clean water from humid air? Just add sunlight

Clean water can be harvested through condensation using stacks of saturated hydrogel. ST PHOTO: LEE HUP KHENG
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SINGAPORE - A research team at the National University of Singapore (NUS) has developed a zinc-based hydrogel that can, with natural sunlight, harvest clean water from humid air, including evaporation from water bodies like the reservoirs in Singapore.

At the heart of it is zinc oxide, a compound found in sunscreens and which functions as a cost-effective and efficient water absorber.

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