Figure 1.
Cluster characterization by Brownian microscopy. (a) Schematic of the BM setup. A green laser illuminates a thin solution layer. The light scattered by particles in the solution is collected by a microscope lens. (b) A representative BM image shown as a negative. The observed volume is ∼120 × 80 × 5 μm3. The clusters are seen as black spots. (c) A typical cluster trajectory determined from a sequence of images. The cluster diffusivities and sizes are evaluated from such trajectories. (d) Distribution of cluster sizes, determined from trajectories such as the one in (c). Only clusters registered for longer than 1 s are considered. To see this figure in color, go online.