Sneaking up on the glassy transition of water

September 26, 2011

Rapid cooling of ordinary water or compression of ordinary ice: either of these can transform normal H2O into an exotic substance that resembles glass in its transparency, brittleness, hardness, and luster. Unlike everyday ice, which has a highly organized crystalline structure, this glass-like material's molecules are arranged in a random, disorganized way. Scientists have studied glassy water for decades, but the exact temperature at which water acquires glass-like properties has been the subject of heated debate for years, due to the difficulty of manipulating pure glassy water in laboratories.

Now, in a paper published in the AIP's , physicists from the University of Pisa and the Consiglio Nazionale delle Ricerche at the Institute for Chemical-Physical Processes (CNR-IPCF) in Pisa, Italy, claim to have put an end to the controversy. Unlike previous attempts in which scientists tried to measure the transition temperature directly, the CNR team "snuck up" on the answer by inferring the temperature from a thorough study of the dynamics of water. They examined water's behavior in bulk and at the nano-scale, at and low, combining their own experimental results with 15 decades' worth of research by colleagues.

They also measured the glass transition temperature and the of water that had been doped with other materials, and used this information to set lower and upper boundaries on the transition temperature for pure water. Taken together, their evidence points to a magic number of approximately 136 Kelvin (-137 Celsius). The authors say their work supports traditional views of this phenomenon and refutes recent claims that the transition is above 160 Kelvin (-113 Celsius). The research could find uses in technology associated with food science and the of biological materials, as well as in the study of water in comets and on the surface of planets.

Explore further: New observations on properties of water

More information: "Resolving the controversy on the glass transition temperature of water?" is published in the Journal of Chemical Physics.

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1 / 5 (2) Oct 02, 2011
Plagiarism in a "family" style
How young ambitious capos and soldiers from Italian Institute of Technology (IIT) under supervision of a decrepit american don-godfather from Northwestern University are successfully completed their sequential plagiaristic enterprise:

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