Subglacial Dehydration of Crystal Hydrate.

Researchers have discovered a porous organic crystal that can adsorb water into 1-nm-wide channels at more than 55% relative humidity, with the water uptake/release being chromogenic. The nanoconfined water is in a state of flux above −70 °C, thus allowing low-temperature dehydration to occur. This discovery unlocks opportunities for designing materials that capture/release water over a range of temperatures that extend well below the freezing point of bulk water.