Nematic order in small systems: measuring the elastic and wall-anchoring constants in vibrofluidized granular rods.
Nematic order in small systems: measuring the elastic and wall-anchoring constants in vibrofluidized granular rods.
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DOI：
10.1103/physrevlett.105.168001
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发表时间：
2010-10-15
影响因子：
8.6
通讯作者：
Harries D
中科院分区：
文献类型：
--
作者：
Galanis J;Nossal R;Losert W;Harries D
我们研究了在一个小的准二维容器小于10杆长度的直径被限制在振动的颗粒棒的有序。随着棒密度ρ的增加，图案化从双极转移到均匀排列。我们发现，一个连续液晶自由能泛函捕获关键图案化功能下降到几乎颗粒大小。通过理论与实验的拟合，我们估算了弯曲和张开弹性常数以及壁锚固的相对值。我们发现对于所有的ρ和测试的杆长度，张开比弯曲更软，而平均弹性常数与壁锚固的比率随着ρ而增加。
We investigate nematic order in vibrated granular rods confined to a small quasi-2D container less than 10 rod lengths in diameter. As rod density ρ increases, patterning shifts from bipolar to uniform alignment. We find that a continuum liquid crystal free energy functional captures key patterning features down to almost the particle size. By fitting theory to experiments, we estimate the relative values of bend and splay elastic constants and wall anchoring. We find that splay is softer than bend for all ρ and rod lengths tested, while the ratio of the average elastic constant to wall anchoring increases with ρ.