  We use confocal microscopy to study the aging of a bidisperse colloidal glass
near rough and smooth boundaries. Near smooth boundaries, the particles form
layers, and particle motion is dramatically slower near the boundary as
compared to the bulk. Near rough boundaries, the layers nearly vanish, and
particle motion is nearly identical to that of the bulk. The gradient in
dynamics near the boundaries is demonstrated to be a function of the gradient
in structure for both types of boundaries.Our observations show that
wall-induced layer structures strongly influence aging.
