Structures in the meniscus of smectic membranes: the role of dislocations?
Structures in the meniscus of smectic membranes: the role of dislocations?
复制标题
近晶膜弯月面的结构：位错的作用？
作者：
M. Selmi;J. Loudet;P. Dolganov;T. Othman;P. Cluzeau
我们报告了一个实验研究的结构周期模式观察到的半月板的独立的近晶薄膜。偏光光学显微镜和相移干涉术的结合使我们能够获得半月板结构的新信息，特别是关于近晶空气界面的地形。我们研究了半月板薄部分条纹结构的波动分布，条纹周期随半月板厚度的变化以及随后向二维结构的过渡。结果表明，二维结构具有不寻常的“蛋盒”型复杂轮廓。条纹织构发生在从非倾斜的smic - a到smic - c *相的冷却过程中，而在这两个相中都存在二维图案。我们讨论了调制结构的可能起源，位错在半月板中的作用，近晶层的弹性，以及位错引起的机械应力。
We report an experimental investigation of the structure of periodic patterns observed in the meniscus of free-standing smectic films. Combination of polarizing optical microscopy and phase shifting interferometry enabled us to obtain new information on the structure of the meniscus, and in particular, on the topography of the smectic-air interface. We investigate the profile of the undulations in the striped structure in the thin part of the meniscus, change of the stripe period with the meniscus thickness and subsequent transition into a two-dimensional structure. It is shown that the two-dimensional structure has an unusual complex profile of "egg-box" type. The striped texture occurs upon cooling from the nontilted smectic-A to the smectic-C* phase, whereas the two-dimensional pattern is present in both phases. We discuss the possible origin of the modulated structures, the role of the dislocations in the meniscus, the elasticity of smectic layers, and the mechanical stress induced by dislocations.
DOI：
10.1073/pnas.0407925101
发表时间：
2004-12-14
影响因子：
11.1
作者：
Choi, MC;Pfohl, T;Safinya, CR
通讯作者：
Safinya, CR