Abstract
The Brownian motion of colloidal particles reduces markedly at a distance of approximately 5 times the particle radius from a solid–liquid interface. This wall-drag effect becomes more prominent for smaller particles. An extremely low coherence dynamic light scattering technique with a supercontinuum source is used to directly observe it. The marked reduction of the diffusion close to the interface can be successfully observed owing to the short temporal coherence length, and the variation of the diffusion coefficient from the region of the constrained diffusion to that of free diffusion can be seamlessly carried out by the path-length-resolved operation.
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