Dynamics of density fluctuations in colloidal gels

被引：28
|
作者：
Krall, AH
Huang, Z
Weitz, DA
机构：
[1] Department of Physics and Astronomy, University of Pennsylvania, Philadelphia
来源：
PHYSICA A | 1997年 / 235卷 / 1-2期
关键词：
gels; colloidal aggregation; fractal dynamics;
D O I：
10.1016/S0378-4371(96)00325-1
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We use dynamic light scattering to measure the dynamic structure factor of density fluctuations occurring in colloidal suspensions that have attained a quiescent state long after aggregation. We find a stretched-exponential decay to a finite plateau. Our interpretation of the arrested decay is that these systems are gels, i.e., systems possessing a finite elastic modulus G. We develop a theory for the internal elastic modes of a fractal cluster and use it to derive G and the arrested, stretched-exponential behavior of colloidal gel dynamics. Good agreement between experiment and theory is obtained.
引用
收藏
页码：19 / 33
页数：15
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