Particle Diffusion and Convection Observed by Dynamic Light Scattering from Aqueous Suspensions of Polystyrene-Latex Particles in Simple Shear Flow

抄録

Dynamic light scattering from dilute aqueous suspensions of polystyrene-latex particles subjected to steady simple shear flow was examined. The diffusion and the convection motions of the particles in shear flow were found to be detected from the measured homodyne correlation function if the intensity profile of the incident laser beam was assumed to be the superposition of the Gaussian- and the box-type of distributions. In addition, it was detected that there are some dynamical motions which might be due to oscillatory fluctuation of the shear gradient or to shear-induced aggregates of the latex-particles.