Wall-drag effect of dense Brownian particles close to solid-liquid interface in low-coherence dynamic light scattering

The wall-drag effect on diffusion of colloidal particles close to the interface wall is investigated by using a low-coherence dynamic light scattering (Low-Coherence DLS). The low-coherence DLS provides a path-lengthresolved measurement in concentrated suspensions and allows us to study the constrained diffusion of the colloidal particles. It is experimentally illustrated that the reduction of the diffusion coefficient close to the interface wall is contributed by the wall-drag effect from the low-coherence DLS measurements. The availability of low-coherence DLS for studies of interactions between particles and interfaces is discussed.

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