Characteristic length of dynamic glass transition near T{sub g} for a wide assortment of glass-forming substances
Dynamic heterogeneity is an active field of glass-transition research. the length scale of this heterogeneity is called the characteristic length. It can be calculated from complex heat capacity curves in the equilibrium liquid or from dynamic calorimetry curves corrected with regard to nonequilibrium. No molecular parameters or microscopic models are necessary for obtaining the length. The authors report the characteristic length near glass temperature for about 30 glass formers including small-molecule liquids, polymers, silicate glasses, a metallic glass, a liquid crystal, and a plastic crystal. The lengths are between 1.0 and 3.5 nm with certain accumulations between 1.0 and 2.0 nm and between 2.5 and 3.5 nm. To try a correlation to other properties, the authors find that at least two should be included, e.g., Angell's fragility and the distance of T{sub g} from the crossover temperature, T{sub c}.
- Research Organization:
- Univ. Halle (DE)
- OSTI ID:
- 20026920
- Journal Information:
- Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical, Vol. 104, Issue 11; Other Information: PBD: 23 Mar 2000; ISSN 1089-5647
- Country of Publication:
- United States
- Language:
- English
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