Jiang Huan, Li Yujiao, Liu Fangfang, Sheng Liping, Tao Cheng-An, Wang Jianfang
College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China.
College of Science, National University of Defense Technology, Changsha 410073, China.
Gels. 2023 Jul 12;9(7):568. doi: 10.3390/gels9070568.
In nature, some organisms have the ability to camouflage to adapt to environmental changes; they blend with the environment by changing their skin colors. Such a phenomenon is of great significance for the research of adaptive camouflage materials. In this study, we propose a novel design scheme for the study of angle-independent photonic materials and successfully prepare an electrically tunable multi-color display angle-independent inverse opal photonic gel (IOPG). After photopolymerization of hydroxyethyl methacrylate with ionizable monomer acrylic acid (AA) in a long-range disordered opal template and etching, the angle-independent inverse opal photonic gel is obtained, presenting a single structural color. The electrically responsive color changes can be achieved at different angles. The color of the disordered AA-IOPG changes from green to blue-green when applying +4 V bias voltage and from green to orange when applying -4 V bias voltage. The electrochromism of the disordered AA-IOPG is mainly due to the local pH change caused by water electrolysis under bias voltage, which leads to a change of the swelling ratio. The disordered AA-IOPG shows high color tunability and durability through repeated opposite bias voltage tests, indicating that it is a promising conductive photonic material.
在自然界中，一些生物体具有伪装能力以适应环境变化；它们通过改变皮肤颜色与环境融为一体。这种现象对于自适应伪装材料的研究具有重要意义。在本研究中，我们提出了一种用于研究角度无关光子材料的新颖设计方案，并成功制备了一种电可调多色显示角度无关反蛋白石光子凝胶（IOPG）。在长程无序蛋白石模板中使甲基丙烯酸羟乙酯与可电离单体丙烯酸（AA）进行光聚合反应并蚀刻后，得到角度无关反蛋白石光子凝胶，呈现单一结构颜色。在不同角度均可实现电响应颜色变化。施加 +4 V 偏置电压时，无序 AA-IOPG 的颜色从绿色变为蓝绿色，施加 -4 V 偏置电压时从绿色变为橙色。无序 AA-IOPG 的电致变色主要归因于偏置电压下水电解引起的局部 pH 变化，这导致溶胀率发生变化。通过重复施加相反偏置电压测试，无序 AA-IOPG 表现出高颜色可调性和耐久性，表明它是一种有前景的导电光子材料。
