TY - JOUR
T1 - Spontaneous patterning of confined granular rods
AU - Galanis, Jennifer
AU - Harries, Daniel
AU - Sackett, Dan L.
AU - Losert, Wolfgang
AU - Nossal, Ralph
PY - 2006/1/20
Y1 - 2006/1/20
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=32644470778&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.96.028002
DO - 10.1103/PhysRevLett.96.028002
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C2 - 16486645
AN - SCOPUS:32644470778
SN - 0031-9007
VL - 96
JO - Physical Review Letters
JF - Physical Review Letters
IS - 2
M1 - 028002
ER -