title: Hydrodynamic measurement of Brownian particles at a liquid-solid interface by low-coherence dynamic light scattering.
abstract: 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.
authors.affiliation: Graduate School for the Creation of New Photonics Industries, 1955-1 Kurematsucho, Nishi-Ku, Hamamatsu, 4311202, Japan. ishii@gpi.ac.jp
authors.forename: Katsuhiro
authors.initials: K
authors.lastname: Ishii
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Iwai
authors.forename: Hui
authors.initials: H
authors.lastname: Xia
mesh_terms: D000465:Algorithms; D004058:Diffusion; D004867:Equipment Design; D008027:Light; D015233:Models, Statistical; D009391:Nephelometry and Turbidimetry; D055095:Optics and Photonics; D010825:Physics / Q000379:methods*; D012542:Scattering, Radiation