Transformations in cryovacuum condensates of ethanol comparison with bulk samples
Abstract
One of the interesting properties of ethanol is its polymorphism, representing different solid phases below the melting point of159K: structural(amorphous) glass obtained by quenching over the cooled liquid below the glass transition temperature g =97K;plastic crystal, which moves to the orientationally disordered crystals upon cooling belowTg =97K;ordered(monoclinic) crystal. This paper presents the IR spectra of differentstructural andphase statesof ethanol atthe appropriate temperatureranges.
References
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2. Kohl I., Bachmann L., Hallbrucker A., Mayer E., Loertingab T. A second distinet structural «state» of high-density amorphous ice at 77 K and 1 bar // Physical Chemistry Chemical Physics. – 2005. – Vol. 3. – P. 3210.
3. Johari G.P. Water's Tg-endotherm, sub-Tg peak of glasses and Tg of water // The Journal of Chemical Physics. - 2003. – Vol. 119. – P. 2935.
4. Yue Y., Angell C.A. Clarifying the glass-transition behaviour of water by comparison with hyperquenched inorganic glasses // Nature. – 2004. – Vol. 427. – p. 717.
5. Aldiyarov A., Aryutkina M., Drobyshev A., Kaikanov M., Kurnosov V. Investigation of dynamic glass transitons and structural transformations in cryovacuum condensates of ethanol // Low Temperature Physics. – 2009. – Vol. 35. – P. 251.
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7. Drobyshev A., Aldiyarov A., Kurnosov V.and all. IR spectroscopy of ethanol in nitrogen cryomatrices with different concentration ratios//Fiz. Nizk. Temp. - 2011. -Vol. 37.– p. 659. (in Russ)
8. Ramos M. Quantitative assessment of the effects of orientational and positional disorder on glassy dynamics // Physical Review. – 1997. – Vol. 78. – P.82.
9. Haida O., Suga H., Seki S.Calorimetric study of the glassy state XII. Prular glass-transition phenomena of ethanol // J. Chemical Thermodynamics. – 1977. – Vol. 9. – P. 1133.
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Published
2014-06-12
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Section
Thermal Physics and Theoretical Thermal Engineering
