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Dynamic Heterogeneity and Kovacs' Memory Effects in Supercooled Water
Loni Kringle1, Bruce D Kay1, Greg A Kimmel1
1Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States.
The Journal of Physical Chemistry. B
|April 25, 2023
Summary
Researchers studied supercooled water
Area of Science:
- Physical Chemistry
- Materials Science
Background:
- Supercooled water properties are key to understanding liquid water and amorphous ices.
- Experimental studies of deeply supercooled water are challenging due to rapid crystallization.
Purpose of the Study:
- Investigate structural relaxation kinetics (aging) in supercooled water.
- Interpret experimental results in challenging phase space regions.
Main Methods:
- Infrared spectroscopy
- Transient heating of nanoscale water films
- Temperature jump protocol analogous to Kovacs' experiments
Main Results:
- Observed memory effects in supercooled water's structural relaxation.
- Water structure showed an extremum upon temperature change before reaching steady-state.
- A random double well model explained the observations.
Conclusions:
- Dynamic heterogeneity in supercooled water influences structural relaxation.
- The study provides insights into the behavior of supercooled water.
- Findings aid in developing theories for liquid water and amorphous ices.
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