He Liqun, Ye Jian, Shuai Min, Zhu Zhuan, Zhou Xufeng, Wang Yanan, Li Yang, Su Zhihua, Zhang Haiyan, Chen Ying, Liu Zhaoping, Cheng Zhengdong, Bao Jiming
Department of Thermal Science & Energy Engineering, University of Science and Technology of China, Hefei, Anhui 230027, China.
Nanoscale. 2015 Feb 7;7(5):1616-22. doi: 10.1039/c4nr06008c.
The recent emergence of liquid crystals of atomically thin two-dimensional (2D) materials not only has allowed us to explore novel phenomena of macroscopically aligned 2D nanomaterials but also has provided a route toward their controlled assembly into three-dimensional functional macrostructures. Using flow-induced mechanical alignment, we prepared flakes of graphene oxide (GO) in different orientational orders and demonstrated that GO liquid crystals (LC) can be used as rewritable media for reflective displays without polarizing optics. With a wire or stick as a pen, we can make the surface of GO LC reflective and bright, and we can then manually draw lines, curves, and any patterns with dark appearance. The contrast between bright and dark features is due to anisotropic optical responses of ordered GO flakes. Since optical anisotropy is an intrinsic property of 2D structures, our observations and demonstration represent one of many potential applications of macroscopically aligned 2D nanomaterials.
最近原子级薄的二维（2D）材料液晶的出现，不仅使我们能够探索宏观排列的二维纳米材料的新现象，而且还为将其可控组装成三维功能宏观结构提供了一条途径。利用流动诱导的机械排列，我们制备了不同取向顺序的氧化石墨烯（GO）薄片，并证明GO液晶（LC）可以用作无需偏振光学元件的反射式显示器的可重写介质。用金属丝或棍棒作为笔，我们可以使GO LC的表面具有反射性且明亮，然后可以手动绘制出具有深色外观的线条、曲线和任何图案。明暗特征之间的对比度源于有序GO薄片的各向异性光学响应。由于光学各向异性是二维结构的固有属性，我们的观察和演示代表了宏观排列的二维纳米材料的众多潜在应用之一。
