FINITE-SIZE EFFECTS ON THE GLASS-TRANSITION TEMPERATURE

被引:20
作者
HUNT, A
机构
[1] Department of Soil and Environmental Sciences, University of California, Riverside
关键词
D O I
10.1016/0038-1098(94)90060-4
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
An expression for the activation energy of the viscosity in the percolative transport regime demonstrates its proportionality to the peak in a distribution of barrier heights as well as to the width of the distribution. Such an expression implies that a ''blocking'' (slower than average) rate is responsible for the macroscopic relaxation time. This concept has recently been shown to account for a large number off phenomena related to the glass transition. Here it is shown that the average of a glass transition temperature over a large number of very small systems must correspond to an average barrier height; consequently the average glass temperature is reduced by confinement in pores because the average barrier height is smaller than the ''blocking'' barrier.
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页码:527 / 532
页数:6
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