Spontaneous Patterning of Confined Granular Rods
arXiv:cond-mat/0508202 · doi:10.1103/PhysRevLett.96.028002
Abstract
Vertically vibrated rod-shaped granular materials confined to quasi-2D containers self organize into distinct patterns. We find, consistent with theory and simulation, a density dependent isotropic-nematic transition. Along the walls, rods interact sterically to form a wetting layer. For high rod densities, complex patterns emerge as a result of competition between bulk and boundary alignment. A continuum elastic energy accounting for nematic distortion and local wall anchoring reproduces the structures seen experimentally.
4 pages, 4 figures, corrected figure formatting
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