Spontaneous patterning of confined granular rods

被引：88

作者：

Galanis, J ^{[1
]}

Harries, D

Sackett, DL

Losert, W

Nossal, R

机构：

[1] NICHHD, NIH, Bethesda, MD 20892 USA

[2] Univ Maryland, Dept Phys, IPST, College Pk, MD 20742 USA

[3] Univ Maryland, Dept Phys, IREAP, College Pk, MD 20742 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.96.028002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

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