Surface Self-Diffusion of an Organic Glass

被引：240
|
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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