Reorientation dynamics in thin glassy films

被引：2
|
作者：
Cecchetto, E [1 ]
Moroni, D [1 ]
Jérôme, B [1 ]
机构：
[1] Univ Amsterdam, Van Hoff Inst Mol Sci, NL-1018 WV Amsterdam, Netherlands
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 2005年 / 17卷 / 19期
关键词：
D O I：
10.1088/0953-8984/17/19/002
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We present a study of orientational relaxation dynamics in thin films of a low-molecular-weight glass former as a function of temperature and film thickness. The relaxation is probed by means of second-harmonic generation after release of a poling electric field. From the measured decays of the second-harmonic signal and their fitting with a stretched exponential, we can determine the distribution of relaxation times in the system. As temperature decreases from above the glass transition, we observe that the width of the distribution first increases under confinement, but that deeper in the glassy state, confinement has no effect any longer on the dynamics.
引用
收藏
页码：2825 / 2842
页数：18
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