Stimuli-Responsive Biomimetic Metallic Luster Films Using Dye Absorption and Specular Reflection from Layered Microcrystals
Stimuli-Responsive Biomimetic Metallic Luster Films Using Dye Absorption and Specular Reflection from Layered Microcrystals
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DOI：
10.1021/acsapm.0c01396
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发表时间：
2021-03-22
影响因子：
5
通讯作者：
Kohri, Michinari
中科院分区：
文献类型：
--
作者：
Kojima, Yuki;Kishikawa, Keiki;Kohri, Michinari
受昆虫着色机理的启发，我们展示了通过层状微晶吸收染料和镜面反射相结合的方法制备金属光泽材料。采用重结晶法制备了含偶氮苯基团不同连接链的二乙炔类化合物的金属光泽薄膜。分子的层状结构形成了板状微晶，这些微晶堆积在一起形成了层状膜。由于偶氮苯部分的吸收和层状微晶表面镜面反射的共同作用，观察到了类金织构。使用十二碳-5，7-二氰酸酯部分作为连接物的二乙炔衍生物的薄膜无论在光或热刺激下都保持其金色。相反，由含有DOCOSA-10，12-diynedioate连接物的二乙炔衍生物组成的薄膜由于紫外光照射的固态聚合而变成紫色，并保持其金属光泽。此外，光泽颜色随温度的变化可逆变化。通过改变连接链的长度来控制金属光泽薄膜对刺激的响应。这里介绍的光敏和热敏金属光泽材料可以对装饰和油墨应用产生重大影响。
Inspired by the coloring mechanism of insects, we demonstrated the preparation of metallic luster materials by a combination of dye absorption and specular reflection from layered microcrystals. Metallic luster films were prepared by the recrystallization of diacetylene derivatives with different linker chains bearing azobenzene moieties. The lamellar structure of the molecules formed plate-like microcrystals, which were piled up to form layered films. A gold-like texture was observed due to the combination of the absorption of the azobenzene moiety and specular reflection from the surface of layered microcrystals. The film of the diacetylene derivative with a dodeca-5,7-diynedioate moiety used as a linker maintained its golden color regardless of light or thermal stimuli. In contrast, the color of the film composed of the diacetylene derivative containing the docosa-10,12-diynedioate linker turned purple due to solid-state polymerization by UV-light irradiation and maintained its metallic gloss. Additionally, the glossy color changed reversibly with changing temperature. The responsiveness of metallic luster films to stimuli was controlled by changing the linker chain length. The photo- and thermal-responsive metallic luster materials presented here can have a significant impact on decoration and ink applications.