Hydrodynamic measurement of Brownian particles at a liquid-solid interface by low-coherence dynamic light scattering

被引：25

作者：

Ishii, Katsuhiro ^{[1
]}

Iwai, Toshiaki ^{[2
]}

Xia, Hui ^{[3
]}

机构：

[1] Grad Sch Creat New Photon Ind, Nishi Ku, Hamamatsu, Shizuoka 4311202, Japan

[2] Tokyo Univ Agr & Technol, Inst Symbiot Sci & Technol, Koganei, Tokyo 1848588, Japan

[3] Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Hunan, Peoples R China

来源：

OPTICS EXPRESS | 2010年 / 18卷 / 07期

关键词：

CORRELATION SPECTROSCOPY; COLLOIDAL SUSPENSIONS; PHOTON-CORRELATION; MOTION; DIFFUSION; MEDIA; WALL; SPHERE; FLUID; WAVE;

D O I：

10.1364/OE.18.007390

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The hydrodynamics of Brownian particles close to a wall is investigated using low-coherence dynamic light scattering. The diffusion coefficient of the particles in a suspension is measured as a function of distance from the wall. A sudden reduction in the diffusion coefficient near the interface is clearly observed using this method. The theoretically predicted wall-drag effect is experimentally confirmed when the influence of the spatial resolution due to the finite coherence length of the light source is accounted for. The space-dependent dynamics of Brownian particles under the wall-drag effect is obtained for the first time using our spatially resolved dynamic light scattering technique. (C) 2010 Optical Society of America

引用

页码：7390 / 7396

页数：7

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