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    The DOE Science News Source is a Newswise initiative to promote research news from the Office of Science of the DOE to the public and news media.
    • 2018-11-09 08:05:37
    • Article ID: 703692

    Probing Water's "No-Man's Land" Temperature Region

    Measuring the physical properties of water at previously unexplored temperatures offers insights into one of the world's essential liquids.

    • Credit: Pacific Northwest National Laboratory

      Researchers used a three-step process to measure water’s properties in a “no-man’s land” temperature range, which was previously inaccessible. The process involves ultrafast laser pulses (ns=nanoseconds) and analysis with Fourier transform infrared (FTIR) spectroscopy.

    The Science

    If you cool water, it freezes—unless it doesn’t. Supercooled liquid water is rather unusual. It remains fluid at ultracold temperatures, but it can freeze. Researchers wanted to know how it solidified, but rapid, uncontrolled crystallization made it impossible. A team of scientists figured out how to take snapshots of supercold liquid water as it froze. They measured how the supercold liquid solidified in the no-man’s land temperature range (262 to 126 Kelvin, or 12 to minus 233 Fahrenheit).

    The Impact

    Water is ubiquitous. It’s also unusual compared to other liquids. And water becomes more odd as it cools. Knowing how water behaves when it is supercold could offer new insights for everything from manufacturing pharmaceuticals to producing power. This research offers new insights. Specifically, the work shows there isn’t a singularly unusual event at or near 228 Kelvin, as some predicted. This information will add to further studies and revise textbook discussions about liquid water’s properties.

    Summary

    While scientists have studied water for a long time, there’s still much that they don’t know. A particularly interesting aspect is supercooled water. From 262 to 126 Kelvin (12 to minus 233 Fahrenheit), water remains a liquid. Given the unique physical properties of water in other temperature regimes, the research team wanted to learn what happened in this previously inaccessible region. They designed a way to get at water in this no-man’s land. They rapidly heated amorphous water films at ~100 Kelvin. Specifically, they heated the film about 1010 Kelvin per second using 10-nanosecond pulses from a laser. This resulted in temperature jumps of ~100 to 200 Kelvin to temperatures where the amorphous film transforms into supercooled liquids. The transient supercooled liquids rapidly cool before the system completely crystallizes. Upon cooling back to the lower temperature, the team probed the physical state of the film using infrared spectroscopy. Once the changes in the film are measured, they repeated the process. In this way, the team measured the speed of crystallization in ~10 nanosecond intervals. Measurements from 262 to 180 Kelvin showed that diffusivity continuously decreases with cooling. Water does not display the singularity predicted by some theoretical models. Instead, the liquid-water diffusivity and crystalline-ice growth rate in no-man’s land varies smoothly. This result provides scientists with new data with which to revise our fundamental understanding of water.

    Funding

    The Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences funded the work. The research was performed using Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by DOE Office of Science’s Office of Biological and Environmental Research.

    Publications

    Y. Xu, N.G. Petrik, R.S. Smith, B.D. Kay, and G.A. Kimmel, “The growth rate of crystalline ice and the diffusivity of supercooled water from 126 K to 262 K.” Proceedings of the National Academy of Sciences USA 113(52), 14921(2016). [DOI: 10.1073/pnas.1611395114]

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    CEBAF Turns on the Charm

    CEBAF Turns on the Charm

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    Department of Energy Announces $20 Million for Artificial Intelligence Research

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    Argonne scientist advances energy sciences through professional leadership

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    PPPL's Young Women's Conference Offers Girls Fun and Inspiration in STEM Fields

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    Fast-Moving Pairs May Solve 35-Year-Old Mystery

    Fast-Moving Pairs May Solve 35-Year-Old Mystery

    Physicists develop a universal mathematical description that suggests that proton-neutron pairs in a nucleus may explain why their associated quarks have lower average momenta than predicted.

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    Atomic Maps Reveal How Iron Rusts

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    Strain and Defects Grow in Tiny Magnetite Crystals When Oxidized

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    A New View on a Very Old Problem: Evolution of the Photochemical Reaction Centers

    A New View on a Very Old Problem: Evolution of the Photochemical Reaction Centers

    Researchers offer insights into how a key piece of photosynthetic machinery changed over 3 billion years.

    How Does Mother Nature Tackle the Tough Triple Bond Found in Nitrogen?

    How Does Mother Nature Tackle the Tough Triple Bond Found in Nitrogen?

    Researchers demystify how the nitrogenase enzyme breaks bonds to learn a better way to make ammonia.


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