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Phys Rev Lett. 2006 Jan 20;96(2):028002. Epub 2006 Jan 19.

Spontaneous patterning of confined granular rods.

Author information

1
NICHD, National Institutes of Health, Bethesda, Maryland 20892-0924, USA.

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.

PMID:
16486645
DOI:
10.1103/PhysRevLett.96.028002
[Indexed for MEDLINE]

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