Science, Space and Technology News 2023
A newly identified process could explain a variety of natural phenomena and enable new approaches to desalination.
At the interface of water and air, light can, in certain conditions, bring about evaporation without the need for heat, according to an MIT study.
“We tested it under our solar simulator, and it worked,” confirming the unusually high evaporation rate, Chen says. “So, we believed them now.” Chen and Tu then began making and testing their own hydrogels. The puffs of white condensation on glass is water being evaporated from a hydrogel using green light, without heat. Credit: Courtesy of the researchers
Though water itself does not absorb much light, and neither does the hydrogel material itself, when the two combine they become strong absorbers, Chen says. That allows the material to harness the energy of the solar photons efficiently and exceed the thermal limit, without the need for any dark dyes for absorption.Having discovered this effect, which they have dubbed the photomolecular effect, the researchers are now working on how to apply it to real-world needs.
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