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January 7, 2021 03:30 am

Liquid Glass Discovered As New State of Matter

An anonymous reader quotes a report from New Atlas: Mundane as it may seem, glass is a surprisingly mysterious material. Now scientists at the University of Konstanz have identified a new state of matter called liquid glass, which has some unusual properties. [...] In the new study, the researchers discovered a form of glass where the atoms exhibit a complex behavior that's never been seen in bulk glass before. Essentially, the atoms can move but aren't able to rotate. The team made this discovery in a model system of colloidal suspensions. These mixtures are made up of large solid particles suspended in a fluid, making it easier for scientists to observe the physical behavior of atoms or molecules. Normally these particles are spheres, but for this experiment the team used elliptical ones so they could tell which direction they were pointing. The researchers tested different concentrations of particles in the fluid, tracking how well they could move and rotate. Eventually they found that at higher concentrations, the particles blocked each other from rotating, but they could still move, forming a liquid glass state. "At certain particle densities orientational motion froze whereas translational motion persisted, resulting in glassy states where the particles clustered to form local structures with similar orientation," says Andreas Zumbusch, lead author of the study. The team says that the observed behavior comes from two competing glass transitions interacting with each other. Liquid glass has been predicted for decades, and the new observation suggests that similar processes could be at work in other glass-forming systems. The research was published in the journal Proceedings of the National Academy of Sciences.

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