Title: NIR-Light-Induced Deformation of Cross-Linked Liquid-Crystal Polymers Using Upconversion Nanophosphors

Author: Wei Wu, Liming Yao, Tianshe Yang, Ruoyuan Yin, Fuyou Li*, Yanlei Yu*

Journal: J. Am. Chem. Soc., 2011, 133(40), 15810-15813

Abstract:

When upconversion nanophosphors were incorporated into an azotolane-containing cross-linked liquid-crystal polymer film, the resulting composite film generated fast bending upon exposure to continuous-wave near-IR light at 980 nm. This occurs because the upconversion luminescence of the nanophosphors leads to trans–cis photoisomerization of the azotolane units and an alignment change of the mesogens. The bent film completely reverted to the initial flat state after the light source was removed.

论文链接：https://pubs.acs.org/doi/abs/10.1021/ja2043276

PDF下载：NIR-Light-Induced Deformation of Cross-Linked Liquid-Crystal Polymers Using Upconversion Nanophosphors.pdf

将上转换纳米荧光粉（UCNPs）加入到含偶氮甲苯的交联液晶聚合物薄膜中，得到的复合薄膜在980 nm的连续近红外光照射下会快速弯曲。这是因为UCNPs将连续近红外光转换为紫外和可见光波长的反射，进而诱导偶氮苯单元的顺反光异构化和液晶单元的排列变化。除去光源后，弯曲膜完全恢复到最初的平坦状态。因此，这种新型的光致形变CLCP系统在人工肌肉驱动器和全光控开关等生物领域具有广阔的应用前景。