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Heat capacity and glass transition of ethylene oxide clathrate hydrate |
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| Authors: | O Yamamuro Y P Handa M Oguni H Suga |
| Institution: | (1) Department of Chemistry and Chemical Thermodynamics Laboratory, Faculty of Science, Osaka University, Toyonaka, 560 Osaka, Japan;(2) Division of Chemistry, National Research Council of Canada, KIA OR9 Ottawa, Ontario, Canada;(3) Present address: Department of Chemistry, Faculty of Science, Tokyo Institute of Technology, O-okayama, Meguro-ku, 152 Tokyo |
| Abstract: | The heat capacity of structure I ethylene oxide clathrate hydrate EO-6.86 H2O was measured in the temperature range 6–300 K with an adiabatic calorimeter. The temperature and enthalpy of congruent melting were determined to be (284.11 ± 0.02) K and 48.26 kJ mol–1, respectively. A glass transition related to the proton configurational mode in the hydrogen-bonded host was observed around 90 K. This glass transition was similar to the one observed previously for the structure II tetrahydrofuran hydrate but showed a wider distribution of relaxation times. The anomalous heat capacity and activation enthalpy associated with the glass transition were almost the same as those for THF-hydrate.Dedicated to Dr D. W. Davidson in honor of his great contributions to the sciences of inclusion phenomena.Author for correspondence. |
| Keywords: | Heat capacity glass transition clathrate hydrate ethylene oxide hydrate |
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