Anisotropy of Brownian motion caused only by hydrodynamic interaction with a wall

被引:68
作者
Holmqvist, Peter [1 ]
Dhont, Jan K. G. [1 ]
Lang, Peter R. [1 ]
机构
[1] Forschungszentrum Julich, Inst Festkorperforsch, Soft Matter Div, D-52425 Julich, Germany
来源
PHYSICAL REVIEW E | 2006年 / 74卷 / 02期
关键词
D O I
10.1103/PhysRevE.74.021402
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
The diffusivity of spherical colloidal particles close to a planar hard wall is studied by dynamic light scattering with evanescent illumination. A novel setup allows us to independently vary the scattering vector components parallel Q(parallel to) and normal Q(perpendicular to) to the wall. An expression for the initial decay rate Gamma of the time autocorrelation functions is derived as a function of both Q(parallel to) and Q(perpendicular to), as well as the penetration depth of the evanescent wave, where hydrodynamic interactions of particles with the wall are included. This makes it possible to study the viscous wall drag effect quantitatively for particles as small as 85 nm in radius.
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页数:5
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