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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 7 — Mar. 29, 2010
  • pp: 7390–7396

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

Katsuhiro Ishii, Toshiaki Iwai, and Hui Xia  »View Author Affiliations

Optics Express, Vol. 18, Issue 7, pp. 7390-7396 (2010)

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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.

© 2010 OSA

OCIS Codes
(290.5820) Scattering : Scattering measurements
(290.5850) Scattering : Scattering, particles
(290.7050) Scattering : Turbid media
(300.6310) Spectroscopy : Spectroscopy, heterodyne

ToC Category:

Original Manuscript: January 4, 2010
Revised Manuscript: March 5, 2010
Manuscript Accepted: March 15, 2010
Published: March 25, 2010

Katsuhiro Ishii, Toshiaki Iwai, and Hui Xia, "Hydrodynamic measurement of Brownian particles at a liquid-solid interface by low-coherence dynamic light scattering," Opt. Express 18, 7390-7396 (2010)

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