基于液晶5CB的静电纺丝光控形变器件

The optical responsive deformation device fabricated by electrospinning liquid crystal 5CB

光控形变器件以其高响应速度在仿生学领域得到广泛关注。通过静电纺丝的方式,成功制备出了一种在可见光波段可实现形变响应并恢复的器件。通过在聚氨酯(TPU)弹性基底膜上静电纺丝有序排列的液晶小分子4-氰基-4'-戊基联苯(5CB)的聚乙烯醇(PVA)纤维膜,可以使其中的5CB在吸热后发生相转变并产生体积收缩,最终带动基底膜实现弯曲形变。通过静电纺丝或涂覆的方式添加光热转换率高的碳纳米管(CNTs),可以进一步赋予该类器件光控响应能力。结果表明,制备的器件因其良好的光控形变性能和光控响应性能,故可作为执行器用于人体仿生学等领域。

Optical responsive deformation device has drawn wide attention in the field of bionics by its rapid response. In this paper, the prepared device that can achieves deforming and recovery property in the visible light band was successfully fabricated by using the electrospinning technology. By electrospinning the polyvinyl alcohol(PVA) fiber film contained with orderly arranged nematic liquid crystal 4-cyano-4’-pentylbiphenyl(5 CB) upon the elastic thermoplastic polyurethane(TPU) substrate, the phase transition and the volume shrunk of the heated liquid crystal 5 CB embedded in the electspun fiber film can be achieved. Finally, the substrate film can be blended by the shrinking of 5 CB. Through adding the carbon nanotubes(CNTs) with well photothermal conversion efficiency in the visible light region to the devices by the way of electrospinning or coating, devices can be endowed with optical responsive deforming properties. Experimental results show that the prepared devices can be applied in the field of human bionics as the actuator by its prominent optical deforming and responding properties.