An unusual substance known as “dry water,” which resembles powdered sugar, could provide a new way to absorb and store carbon dioxide,
the major greenhouse gas that contributes to global warming, scientists reported at the 240th National Meeting of the American Chemical Society.
The powder shows bright promise for a number of other uses, they said. It may, for instance, be a greener, more energy-efficient way of jumpstarting the chemical reactions used to make hundreds of consumer products. Dry water also could provide a safer way to store and transport potentially harmful industrial materials.
“There’s nothing else quite like it,” said Ben Carter, Ph.D., researcher for study leader Professor Andrew Cooper. “Hopefully, we may see ‘dry water’ making waves in the future.”
Carter explained that the substance became known as “dry water” because it consists of 95 percent water and yet is a dry powder. Each powder particle contains a water droplet surrounded by modified silica, the stuff that makes up ordinary beach sand. The silica coating prevents the water droplets from combining and turning back into a liquid. The result is a fine powder that can slurp up gases, which chemically combine with the water molecules to form what chemists term a hydrate.
Dry water was discovered in 1968 and got attention for its potential use in cosmetics. Scientists at the University of Hull, U.K. rediscovered it in 2006 in order to study its structure, and Cooper’s group at the University of Liverpool has since expanded its range of potential applications.
One of the most recent involves using dry water as a storage material for gases, including carbon dioxide. In laboratory-scale research, Cooper and co-workers found that dry water absorbed over three times as much carbon dioxide as ordinary, uncombined water and silica in the same space of time. This ability to absorb large amounts of carbon dioxide gas as a hydrate could make it useful in helping to reduce global warming, the scientists suggested.
Cooper and colleagues demonstrated in previous studies that dry water is also useful for storing methane, a component of natural gas, and may help expand its use as a future energy source. In particular, they hope that engineers can use the powder to collect and transport stranded deposits of natural gas. This also exists on the ocean floor in the form of gas hydrates, a form of frozen methane also known as the “ice that burns.” The powder could also provide a safer, more convenient way to store methane fuel for use in vehicles powered by natural gas. “A great deal of work remains to be done before we could reach that stage,” Carter added.