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Dept of Physics
Granular materials generally transition between a liquid-like or flowing state and a solid-like or stationary state via a process known as jamming. We study the jamming transition by flowing sub-micron sized beads through micron-sized channels. We can monitor bead species of different sizes by using fluorescent beads with different spectra. We are working with Dr. Riehn of the Nanobiofluidics lab to study how polydispersity affects the jamming transition.
The image on the left shows bead jamming and segregation in micron-sized channels. Green fluorescent beads have 820nm diameter. Red fluorescent beads have 730nm diameter.