Surface Self-Diffusion of an Organic Glass

被引：245

作者：

Zhu, L. ^{[2
]}

Brian, C. W. ^{[2
]}

Swallen, S. F. ^{[2
]}

Straus, P. T. ^{[2
]}

Ediger, M. D. ^{[2
]}

Yu, L. ^{[1
,2
]}

机构：

[1] Univ Wisconsin, Sch Pharm, Madison, WI 53705 USA

[2] Univ Wisconsin, Dept Chem, Madison, WI 53706 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 25期

基金：

美国国家科学基金会;

关键词：

INDOMETHACIN; DYNAMICS; MOBILITY;

D O I：

10.1103/PhysRevLett.106.256103

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

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页数：4

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