Surface Self-Diffusion of an Organic Glass

TitleSurface Self-Diffusion of an Organic Glass
Publication TypeJournal Article
Year of Publication2011
AuthorsZhu, L., C. W. Brian, S. F. Swallen, P. T. Straus, M. D. Ediger, and L. Yu
JournalPhysical Review Letters
Volume106
Start Page256103
ISBN Number0031-9007
Accession NumberWOS:000292040900012
KeywordsCOEFFICIENTS, DYNAMICS, FILMS, INDOMETHACIN, MOBILITY, POLYMERS
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.

DOI10.1103/PhysRevLett.106.256103
Alternate JournalPhys. Rev. Lett.