Steam to Stream
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Shimmering on the surface of a distant puddle, water turns to steam, warmed by the sun’s energy. A similar form of evaporation is harnessed here – generating a plume of steam that can be cooled into high-quality drinking water. The design for this ‘steam generator’ features organic components – a light ‘aerogel’ peppered with organic molecules that absorb up to 99% of the sun’s energy, while at the same time soaking up water from beneath. Exposed to the trapped heat, the water quickly evaporates to steam, leaving impurities – like salt or dirt – behind. The device is cheap to make, raising hopes for widespread use in desalinating water in parts of the world where potable water is scarce, currently affecting over two billion people.
Written by John Ankers
Image by Thor Balkhed
Research from the Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping, Sweden
Image copyright held by the photographer
Research published in Advanced Sustainable Systems, April 2020
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