Harvesting water from the air with organic crystals

A new way to harvest water from the air has been observed on subliming organic crystals. Similar techniques are used by some desert plants and animals. The Namib Desert beetle, for example, condenses fog via an array of hydrophilic bumps across the waxy superhydrophobic surface on its back that then funnels it into its mouth.

For the first time, researchers have observed water spontaneously condensing and moving across the surface of a slowly subliming organic crystal. ‘This was found to be caused by changes in the width of small channels that appear on the surface of the crystal over time, which guide the condensed water across the crystal’s surface,’ the researchers from the New York University Abu Dhabi in the United Arab Emirates note. They suggest that this could be a novel way of combating water scarcity across the globe, particularly in desert areas. The condensation observed occurs on the surface of crystals of hexachlorobenzene.