Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 128, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2919570
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We have used neutron reflectivity to measure translational motion on the nanometer length scale in exceptionally stable glasses of tris(naphthylbenzene). These glasses are prepared by vapor deposition onto a substrate held somewhat below the glass transition temperature (T-g=342 K). When the most stable samples are annealed at 345 K, no translational motion is observed on the 12 nm length scale for over 10 000 s and full mixing requires more than 60 000 s. For comparison, the equilibrium supercooled liquid mixes in 1000 s at this temperature and on this length scale. These measurements provide insight into the mechanism by which a stable glass transforms into a liquid. Melting of the stable glass appears to occur by the growth of liquid regions into the surrounding glassy matrix, perhaps by a surface-initiated growth process. At 345 K, translational motion in the stable glass is at least 100 times slower than motion in the supercooled liquid. (C) 2008 American Institute of Physics.
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