图 书 馆
几何，拓扑和液晶：材料应用Geometry, topology, and liquid crystals: The materials applications |
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| 课程网址: | http://videolectures.net/kolokviji_yang_liquid_crystals/ |
| 主讲教师: | Shu Yang |
| 开课单位: | 宾夕法尼亚大学 |
| 开课时间: | 2019-07-16 |
| 课程语种: | 英语 |
| 中文简介: |  “几何也许是科学中最基础的”。几何与点，线和圆的配置属性有关，而拓扑与空间，尺寸和变换有关。我们将讨论发现几何之美和力量的旅程，以及在各种规模的各种材料中的应用。通过设计几何表面图案（这里是微柱阵列），我们可以对拓扑缺陷进行编程，从而对液晶组件中的方向弹性进行编程。当结合化学图案形成和表面形貌时，我们证明了对称性破坏，允许进行多态光学开关。几何形状与材料无关。利用小分子液晶的知识，我们可以在2D的液晶弹性片中预编程任意3D形状。通过与软力耦合，我们将MXene系列的碳化钛原子薄的二维二维纳米钛板垂直排列，以存储更多的能量。几何也是尺度不变的。最后，我们将展示采用几何图形来创建智能织物的前景。 |
| 课程简介: | “Geometry is perhaps the most elementary of the sciences”. Geometry is concerned with the properties of configurations of points, lines, and circles, and topology is concerned with space, dimension, and transformation. We will discuss our journey of discovering the beauty and power of geometry, and applications in a wide variety of materials at all scales. Through designs of geometric surface patterns, here, micropost arrays, we program topological defects, and thus the orientational elasticity in liquid crystal assemblies. When coupling chemical patterning and surface topography, we demonstrate symmetry breaking, allowing for multi-state optical switching. Geometry is materials independent. Taking the knowledge in small molecule liquid crystals, we preprogram arbitrary 3D shapes in 2D sheets of liquid crystal elastomers. By coupling with soft forces, we vertically aligned atomically thin 2D nanosheets of titanium carbide from the MXene family up to 200 m to store more energy. Geometry is also scale invariant. Lastly, we will show the prospective of taking geometry to create smart fabrics. |
| 关 键 词: | 几何; 拓扑; 材料应用 |
| 课程来源: | 视频讲座网 |
| 数据采集: | 2020-11-09：cjy |
| 最后编审: | 2020-11-10：zyk |
| 阅读次数: | 34 |