Although hierarchical assemblies of colloidal particles add novel structure-based functions to systems, few local and on-demand colloidal structures have been developed. We have combined the colloidal liquid crystallinity of two-dimensional inorganic particles and laser radiation pressure to obtain a large hierarchical and local structure in a colloidal system. The scattering force of the laser beam converted the parallel nanosheet alignment to the direction of the incident laser beam. At the focal point, the nanosheet orientation depends on the electric field of the polarized laser beam. In contrast, a giant tree-ring-like nanosheet texture of more than 100 μm, and which is independent of the polarization direction, was organized at the periphery of the focal point. This organization resulted from a cooperative effect between the liquid-crystalline nanosheets, which indicates an effectiveness of optical manipulation to construct hierarchical colloidal structures with the aid of interparticle interactions.

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辐射压诱导的液晶无机纳米片的层级结构

尽管胶体粒子的分层装配为系统增加了基于结构的新颖功能，但很少开发出局部和按需胶体结构。我们结合了二维无机颗粒的胶态液晶性和激光辐射压力，在胶体体系中获得了较大的分层和局部结构。激光束的散射力将平行的纳米片排列转换为入射激光束的方向。在焦点处，纳米片的取向取决于偏振激光束的电场。相反，在焦点的外围组织了大于100μm的巨大树状纳米片纹理，并且该纹理与偏振方向无关。