Development of Light-driven Crystal Machinery

利用光机械晶体研究了晶体机械的构造，这种晶体在光照射下表现出光机械弯曲运动。然而，由于耐久性不足，使用一片单晶作为晶体机是不切实际的。单晶与一些软材料如聚合物的复合材料可能会增加机械装置的可能性。制备了水杨醛苯乙胺类手性和非手性晶体在磁场作用下取向的有机硅聚合物薄膜。此外，液体树脂悬浮液的表面的摩擦也给出了晶体的取向。聚合物膜表现出可逆的光机械弯曲时，交替照射紫外线和可见光。总之，元器件技术是为了制造晶体机械而发展起来的。

Construction of crystal machinery was studied by utilizing photomechanical crystals, which exhibit photomechanical bending motion upon photoirradiation. However, it is impractical to use one piece of a single crystal as a crystal machine due to insufficient durability. A composite of single crystals with some soft materials such as polymers may increase the possibility for mechanical devices. Silicone polymer films in which plate-like chiral and achiral crystals of salicylidenephenylethylamines were aligned by a magnetic field were prepared. Further, rubbing of the surface of liquid resin suspension also gave alignment of crystals. The polymer films exhibited reversible photomechanical bending upon alternate irradiation with UV and visible light. In conclusion, element technology was developed to make crystal machinery.