Spontaneous Patterning of Confined Granular Rods

Details Spontaneous Patterning of Confined Granular Rods Spontaneous Patterning of Confined Granular Rods

2005-08-08

arxiv.org/abs/cond-mat/0508202v2

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures, corrected figure formatting

Scientific paper

10.1103/PhysRevLett.96.028002

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.

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