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- W2326197465 abstract "Surface self-diffusion coefficients have been determined for the organic glass Nifedipine using the method of surface grating decay. The flattening of 1000 nm surface gratings occurs by viscous flow at 12 K or more above the glass transition temperature and by surface diffusion at lower temperatures. Surface diffusion is at least 107 times faster than bulk diffusion, indicating a highly mobile surface. Nifedipine glasses have faster surface diffusion than the previously studied Indomethacin glasses, despite their similar bulk relaxation times. Both glasses exhibit fast surface crystal growth, and its rate scales with surface diffusivity. The observed rate of surface diffusion implies substantial surface rearrangement during the preparation of low-energy glasses by vapor deposition. The Random First Order Transition Theory and the Coupling Model successfully predict the large surface-enhancement of mobility and its increase on cooling, but disagree with the experimental observation of the faster surface diffusion of Nifedipine." @default.
- W2326197465 created "2016-06-24" @default.
- W2326197465 creator A5058164102 @default.
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- W2326197465 date "2013-08-01" @default.
- W2326197465 modified "2023-10-12" @default.
- W2326197465 title "Surface Self-Diffusion of Organic Glasses" @default.
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- W2326197465 doi "https://doi.org/10.1021/jp404944s" @default.
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