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Phys Rev Lett. 2011 Jun 24;106(25):256103. Epub 2011 Jun 24.

Surface self-diffusion of an organic glass.

Author information

1
Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.

Abstract

Surface self-diffusion has been measured for an organic glass for the first time. The flattening of 1000 nm surface gratings of liquid indomethacin 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 10(6) times faster than bulk diffusion, indicating a highly mobile surface. Our data suggest that surface diffusion is the leading mechanism of surface evolution for organic glasses at micrometer to nanometer length scales.

PMID:
21770657
DOI:
10.1103/PhysRevLett.106.256103
[Indexed for MEDLINE]

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