Dynamics in dense suspensions of charge-stabilized colloidal particles

被引：20

作者：

Robert, A. ^{[1
]}

Wagner, J. ^{[2
]}

Haertl, W. ^{[3
]}

Autenrieth, T. ^{[4
]}

Gruebel, G. ^{[4
]}

机构：

[1] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[2] Univ Saarland, D-66123 Saarbrucken, Germany

[3] Wallburg Realschule, D-97483 Eltmann, Germany

[4] HASYLAB, DESY, D-22607 Hamburg, Germany

来源：

EUROPEAN PHYSICAL JOURNAL E | 2008年 / 25卷 / 01期

关键词：

D O I：

10.1140/epje/i2007-10265-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The dynamic behavior of charge-stabilized colloidal particles in suspension was studied by photon correlation spectroscopy with coherent X-rays (XPCS). The short-time diffusion coefficient, D(Q), was measured for volume concentrations phi <= 0.18 and compared to the free particle diffusion constant D-0 and the static structure factor S(Q) . The data show that indirect, hydrodynamic interactions are relevant for the system and hydrodynamic functions were derived. The results are in striking contrast to the predictions of the PA (pairwise-additive approximation) model, but show features typical for a hard-sphere system. The observed mobility is however considerably smaller than the one of a respective hard-sphere system. The hydrodynamic functions can be modelled quantitatively if one allows for an increased effective viscosity relative to the hard-sphere case.

引用

页码：77 / 81

页数：5