题目：Nanosheet Liquid Crystals: Structured Colloids Constructed by Inorganic 2D Particles
主讲简介：Teruyuki Nakato，日本九州工业大学教授。研究专长：低维无机纳米材料、无机软材料化学。先后在日本早稻田大学取得学士、硕士和博士学位，先后在日本早稻田大学、北海道大学、东京农业大学工作，2011年至今任日本九州工业大学教授，日本科学技术部PRESTO 研究员称号。分别在Angew. Chem. Int. Ed.，Adv. Mater.，J. Phys. Chem. B 及J. Phys. Chem. C等国际知名刊物发表论文80余篇。
主讲内容：Colloidal liquid crystals (LCs) of inorganic particles are very rare examples of inorganic soft structures. The LC phase is entropically driven based on the particles’ excluded volume effect. In the inorganic colloidal LCs, crystalline inorganic particles are mobile but ordered. Versatile properties of inorganic crystals such as semiconducting, dielectric, and (photo)catalytic functions, can be utilized in such materials. Colloidal LCs of inorganic nanosheets, called nanosheet LCs, are typical examples of such systems. They are constructed by extremely thin 2D particles obtained by exfoliation of inorganic layered crystals in solvents. The nanosheet LCs are characterized by mm-size mesogens with high anisotropy ensured by their thickness of around 1 nm. They are distinguished from conventional organic molecular LCs because of the mesogen size being much larger than that of molecules and the crystallinity of the mesogens. The size and robustness of the crystalline mesogens of the nanosheet LCs allow multiscale organization of hierarchical structures controlled over all length-scale from micro-, meso-, to macroscopic, which is impossible with the conventional organic LCs. The nanosheets have rich alternatives of arrangements for higher-order structures compared with 1D rods, because 2D particles have two different axes for regulation of their alignment.