Department of Applied Chemistry and Bio-chemistry, Kumamoto University, 2-39-1 Kurokami, Kumamoto, Japan.
Chemistry. 2011 Jan 10;17(2):508-15. doi: 10.1002/chem.201001238. Epub 2010 Nov 12.
In this paper the photocontrolled manipulation of solid materials on the surface of a liquid crystalline thin film is described. Three different types of films namely cholesteric liquid crystal (ChLC), compensated nematic liquid crystal (NLC) and nematic LC were used. The rotational and translational manipulation of the microscale solid object was induced by irradiation of light and mode of manipulation (either translational or rotational) was changed by changing the isomer of the azobenzene compound used to make the film. Rotational motion of the object was observed on the ChLC and compensated NLC films containing chirally pure azobenzene compound. The direction of rotational motion was controlled either by changing the optical isomer of the chiral azobenzene or by changing the irradiating light (from ultraviolet to visible). When racemic mixture of the chiral azobenzene compound was used, a translational motion of the object was observed. Even though the direction of the translational motion can be controlled by controlling irradiation position, more facile and precise manipulation of the objects was possible by spatially controlled irradiation of Ar(+) laser and diode UV laser.
本文描述了在液晶薄膜表面通过光控制对固体材料的操纵。使用了三种不同类型的薄膜，即胆甾相液晶（ChLC）、补偿向列相液晶（NLC）和向列相液晶。通过照射光并改变用于制造薄膜的偶氮苯化合物的异构体，可以诱导微尺度固体物体的旋转和平移操纵，并且可以改变操纵模式（旋转或平移）。在含有手性纯偶氮苯化合物的 ChLC 和补偿 NLC 薄膜上观察到了物体的旋转运动。通过改变手性偶氮苯的光学异构体或改变照射光（从紫外光到可见光），可以控制旋转运动的方向。当使用手性偶氮苯化合物的外消旋混合物时，观察到物体的平移运动。尽管可以通过控制照射位置来控制平移运动的方向，但通过 Ar(+)激光和二极管 UV 激光的空间控制照射，可以更方便、更精确地操纵物体。
