ASU professor helps solve mystery of gl...(nd network it behaves as if it is in a c...)

Date:1/31/2008

nd network, it behaves as if it is in a crystalline phase, making what is known as an order-disorder transition. This sucks out all of the heat capacity at temperatures around 220 K and explains why the glass transition in water (near 136 K) is so undramatic compared to other substances.

It also gave Angell an idea for a new scenario to explain the odd behavior of supercooled water, one that is compatible with observed behavior but does not require a critical point.

I wanted to find the answer to the puzzle of what was happening in no mans land, Angell says. And so I worked up from the glassy state and nanoconfinement.

In the end, we say, Well that thats not what bulk water would do thats been thrust upon it by making it so tiny, he explains. But nevertheless its an important part of the picture and it supports the conclusion that weve got a different sort of thermodynamics in water than we have in any of these other molecular glass-forming liquids.

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Contact: Skip Derra skip.derra@asu.edu 480-965-4823 Arizona State University Source:Eurekalert

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