| Autor: |
Swallen, Stephen F., Mapes, Marie K., Yong Seol Kim, McMahon, Robert J., Ediger, M. D., Satija, Sushil |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 5/14/2006, Vol. 124 Issue 18, p184501, 9p, 1 Diagram, 1 Chart, 9 Graphs |
| Abstrakt: |
The translational dynamics of the low molecular weight glass-former tris(naphthylbenzene) have been studied on the length scale of a few nanometers at the glass transition temperature Tg. Neutron reflectivity was used to measure isotopic interdiffusion of multilayer samples created by physical vapor deposition. Deposition with the substrate held at Tg-6 K allows observation of dynamics characterizing the equilibrium supercooled liquid. The diffusion coefficient measured at q=0.03 Å-1 was determined to be 1×10-17 cm2/s at 342 K (Tg). The self-part of the intermediate scattering function Is(q,t) decays exponentially. Samples deposited well below Tg show a substantial thermal history effect during subsequent translational motion at Tg. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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