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arXiv 1502.03583cond-mat.softphysics.class-ph
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二维杆在狭缝孔和方腔中的约束

Confinement of two-dimensional rods in slit pores and square cavities

Thomas Geigenfeind, Sebastian Rosenzweig, Matthias Schmidt, Daniel de las Heras

摘要:

使用蒙特卡罗模拟,我们分析了四种不同类型的几何约束的二维硬棒的行为:(一)一个狭缝孔,其中的颗粒被限制在两个平行的壁与垂面锚定;(二)一个混合狭缝孔形成的平面和垂面壁;方腔,挫败的取向顺序施加(三)垂面或(四)平面壁锚定。我们提出的结果作为包装分数和限制程度的函数的状态图。在极端约束下,意外的状态出现较低的对称性比那些相应的稳定状态的散装,如形成的状态,打破锚定约束或表面施加的对称性。在这两种类型的方腔中,颗粒在中等密度下形成向错。然而,在高密度下,弹性应力通过畴壁的形成而松弛,其中指向矢突然旋转90度。

英文摘要:

Using Monte Carlo simulation, we analyse the behaviour of two-dimensional hard rods in four different types of geometric confinement: (i) a slit pore where the particles are confined between two parallel walls with homeotropic anchoring; (ii) a hybrid slit pore formed by a planar and a homeotropic wall; square cavities that frustrate the orientational order by imposing either (iii) homeotropic or (iv) planar wall anchoring. We present results for the state diagram as a function of the packing fraction and the degree of confinement. Under extreme confinement, unexpected states appear with lower symmetries than those of the corresponding stable states in bulk, such as the formation of states that break the anchoring constraints or the symmetry imposed by the surfaces. In both types of square cavities the particles form disclinations at intermediate densities. At high densities, however, the elastic stress is relaxed via the formation of domain walls where the director rotates abruptly by ninety degrees.

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