Periodic Stratified Porous Structures in Dynamic Polyelectrolyte Films Through Standing-Wave Optical Crosslinking for Structural Color,Advanced Science

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Periodic Stratified Porous Structures in Dynamic Polyelectrolyte Films Through Standing-Wave Optical Crosslinking for Structural Color
Advanced Science ( IF 14.3 ) Pub Date : 2021-05-27 , DOI: 10.1002/advs.202100402
Wei-Pin Huang ₁ , Hong-Lin Qian ₁ , Jing Wang ₁ , Ke-Feng Ren _{1,

2} , Jian Ji _{1,

2}

Affiliation

Periodic porous structures have been introduced into functional films to meet the requirements of various applications. Though many approaches have been developed to generate desired structures in polymeric films, few of them can effectively and dynamically achieve periodic porous structures. Here, a facile way is proposed to introduce periodic stratified porous structures into polyelectrolyte films. A photo-crosslinkable polyelectrolyte film of poly(ethylenimine) (PEI) and photoreactive poly(acrylic acid) derivative (PAA-N₃) is prepared by layer-by-layer (LbL) self-assembly. Stratified crosslinking of the PEI/PAA-N₃ film is generated basing on standing-wave optics. The periodic stratified porous structure is constructed by forming pores in noncrosslinked regions in the film. Thanks to the dynamic mobility of polyelectrolytes, this structural controlment can be repeated several times. The size of pores corresponding to the layer spacing of the film contributes to the structural colors. Furthermore, structural color patterns are fabricated in the film by selective photo-crosslinking using photomasks. Although the large-scale structural controlment in thick (micron-scale and above) films needs to be explored further, this work highlights the periodic structural controlment in polymeric films and thus presents an approach for application potentials in sensor, detection, and ink-free printing.

中文翻译：

通过驻波光学交联获得动态聚电解质薄膜中的周期性分层多孔结构以获得结构颜色

周期性多孔结构已被引入功能薄膜中以满足各种应用的要求。尽管已经开发了许多方法来在聚合物薄膜中产生所需的结构，但很少有方法能够有效且动态地实现周期性多孔结构。在这里，提出了一种简便的方法将周期性分层多孔结构引入聚电解质膜中。通过层层自组装（LbL）制备了聚乙烯亚胺（PEI）和光反应性聚丙烯酸衍生物（PAA-N _{3 ）的光交联聚电解质薄膜。}PEI/PAA-N ₃薄膜的分层交联是基于驻波光学产生的。通过在膜中的非交联区域中形成孔来构建周期性分层多孔结构。由于聚电解质的动态迁移率，这种结构控制可以重复多次。与薄膜的层间距相对应的孔的尺寸有助于结构颜色。此外，通过使用光掩模进行选择性光交联，在薄膜中制造结构颜色图案。尽管厚（微米级及以上）薄膜中的大规模结构控制需要进一步探索，但这项工作突出了聚合物薄膜中的周期性结构控制，从而提出了一种在传感器、检测和无墨应用潜力的方法印刷。

更新日期：2021-08-04

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