Clever materials make it easier to pull clean water from the air

MIT Technology Review  September 27, 2019 Providing the global population with clean drinking water is one of the great engineering challenges of the 21st century. As significant amount of water vapor is stored in the atmosphere, dew harvesting holds potential for freshwater harvesting. An international team of researchers (China, USA) has developed a theoretical framework to analyze due harvesting. They provided a numerical design of a selective emitter, consisting of six layers optimized for dew-harvesting purposes. According to the researchers at an ambient temperature of 20 °C (68 °F) with a relative humidity of 40%, the selective emitter could harvest […]