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Figure 1 The nanocomposite film produces significant strain before light (left) and after light (right)
Fig. 2 a) Nanometric gradient distribution composite film cross-section SEM and b) Photomechanical response curve (inset)
Photo-deformable material is a kind of smart material that deforms (stretches and bends) under the irradiation of specific wavelengths of light (ultraviolet, visible light, etc.), and has a remote, non-contact, multi-selective control mode. In the field of efficient use of light energy, such as photosensitive switches, optical sensors, optical drive motors, and other applications that convert light energy directly into kinetic energy. Compared to azobenzene-induced photodegradation macromolecule materials, organic dye molecular crystals with photoisomerization properties have better repeatability and faster response rate, and are a class of photodeformation emerging in recent years. Materials, but how to effectively implement molecular-scale efficient photomechanical conversion at the macroscale is the biggest challenge for such smart materials.
Recently, the research group of Chen Wei, the international laboratory of the Suzhou Nanotechnology and Nanobionics Research Institute of the Chinese Academy of Sciences, has made significant progress in the study of the nanomolecular organic dye molecular crystal composite photomechanical response system and has pioneered the N-α-naphthyl-2-hydroxy group. Nanoscale rod-like crystals of 1-naphthaldehyde aldehyde imine molecules were assembled in-situ in polyvinylidene fluoride matrix in a manner similar to the selective orientation and gradient distribution of liquid crystals, resulting in a novel intelligent photoinduced deformation film material. The film can be significantly bent under weaker 365 nm UV light and fully recovered under dark conditions. In this study, by means of assembly, the efficient photomechanical conversion of nanocrystals close to the molecular level will be efficiently scaled up to the macroscopic size, providing an important idea for the design of new photodeformation-intelligent materials. Related research results have been received by Angew. Chem. Int. Ed. (DOI: 10.1002/anie.201300856) and published in the online version.
The study was strongly supported by the National Natural Science Foundation of China, the Ministry of Science and Technology, and the Natural Science Foundation of Jiangsu Province.
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