Single crystal texture by directed molecular self-assembly along dual axes.,Nature Materials

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Single crystal texture by directed molecular self-assembly along dual axes.
Nature Materials ( IF 37.2 ) Pub Date : 2019-06-17 , DOI: 10.1038/s41563-019-0389-1
Xunda Feng _{1,

2} , Kohsuke Kawabata ₃ , Matthew G Cowan _{4,

5} , Gregory E Dwulet ₄ , Kristof Toth ₁ , Lucas Sixdenier ₆ , Amir Haji-Akbari ₁ , Richard D Noble ₅ , Menachem Elimelech ₁ , Douglas L Gin _{4,

5} , Chinedum O Osuji _{1,

7}

Affiliation

Creating well-defined single-crystal textures in materials requires the biaxial alignment of all grains into desired orientations, which is challenging to achieve in soft materials. Here we report the formation of single crystals with rigorously controlled texture over macroscopic areas (>1 cm2) in a soft mesophase of a columnar discotic liquid crystal. We use two modes of directed self-assembly, physical confinement and magnetic fields, to achieve control of the orientations of the columnar axes and the hexagonal lattice along orthogonal directions. Field control of the lattice orientation emerges in a low-temperature phase of tilted discogens that breaks the field degeneracy around the columnar axis present in non-tilted states. Conversely, column orientation is controlled by physical confinement and the resulting imposition of homeotropic anchoring at bounding surfaces. These results extend our understanding of molecular organization in tilted systems and may enable the development of a range of new materials for distinct applications.

中文翻译：

通过沿双轴定向分子自组装的单晶结构。

在材料中创建明确定义的单晶纹理需要将所有晶粒双轴排列成所需的方向，这在软材料中是具有挑战性的。在这里，我们报告了在柱状盘状液晶的软中间相中在宏观区域 (>1 cm2) 上形成了具有严格控制纹理的单晶。我们使用定向自组装、物理约束和磁场两种模式来实现对柱状轴和六角晶格沿正交方向的方向的控制。晶格取向的场控制出现在倾斜disogens的低温阶段，打破了在非倾斜状态下存在的柱轴周围的场简并。反过来，柱的方向由物理限制和由此产生的在边界表面上的垂直锚定控制。这些结果扩展了我们对倾斜系统中分子组织的理解，并可能为不同应用开发一系列新材料。

更新日期：2019-06-17

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