Researchers have created a never-before-seen form of ice with a disorganized structure and a density almost exactly that of liquid water.
Using ultracold temperatures and some steel ball bearings, scientists have created a brand-new, bizarre form of ice that has the same density of liquid water.
Grinding iceWhen ice freezes normally on Earth, its molecules stack into an organized crystalline structure. This crystalline ice is one of the weird quirks of H2O, because it floats on liquid water in its solid state rather than sinking. This is due to the relatively big gaps in the crystal structure of water ice, compared with other materials that form denser structures when they crystallize.
A ball mill is a device kind of like a very advanced cocktail shaker. A material is put into a chamber with stainless-steel balls and shaken or turned until the material is ground up. Ball milling is used in many industries, but it's particularly good at creating amorphous materials and at grinding soft, frozen materials into powders, Salzmann said. Weird propertiesThe researchers expected that the ball mill would just break the ice crystals into smaller ice crystals.
"With other forms of [amorphous] ice, if you compress them and you release the pressure, it's like nothing happened," Salzmann said."But the MDA [medium-density amorphous ice] somehow has this ability to store the mechanical energy and release it through heating."—New study turns understanding of ice upside-down
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