Aging of rotational diffusion in colloidal gels and glasses

被引：11
|
作者：
Jabbari-Farouji, S. [1 ,2 ,3 ]
Wegdam, G. H. [1 ,2 ]
Bonn, Daniel [1 ,2 ,4 ]
机构：
[1] CNRS, LPTMS, F-91405 Orsay, France
[2] Univ Paris 11, UMR8626, F-91405 Orsay, France
[3] Univ Amsterdam, Van der Waals Zeeman Inst, Inst Phys IoP, Fac Sci FNWI, NL-1098 XH Amsterdam, Netherlands
[4] Lab Phys Stat ENS, F-75231 Paris 05, France
来源：
PHYSICAL REVIEW E | 2012年 / 86卷 / 04期
关键词：
LAPONITE; TRANSITION; DYNAMICS;
D O I：
10.1103/PhysRevE.86.041401
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
We study the rotational diffusion of aging Laponite suspensions for a wide range of concentrations using depolarized dynamic light scattering. The measured orientational correlation functions undergo an ergodic to nonergodic transition that is characterized by a concentration-dependent ergodicity-breaking time. We find that the relaxation times associated with rotational degree of freedom as a function of waiting time, when scaled with their ergodicity-breaking time, collapse on two distinct master curves. These master curves are similar to those previously found for the translational dynamics; the two different classes of behavior were attributed to colloidal gels and glasses. Therefore, the aging dynamics of rotational degree of freedom provides another signature of the distinct dynamical behavior of colloidal gels and glasses.
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页数：7
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