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Tough and Variable-Band-Gap Photonic Hydrogel Displaying Programmable Angle-Dependent Colors
ACS Omega ( IF 3.7 ) Pub Date : 2018-01-04 00:00:00 , DOI: 10.1021/acsomega.7b01443 Md Anamul Haque 1, 2 , Kei Mito 1 , Takayuki Kurokawa 1, 1 , Tasuku Nakajima 1, 1 , Takayuki Nonoyama 1, 1 , Muhammad Ilyas 1 , Jian Ping Gong 1, 1
ACS Omega ( IF 3.7 ) Pub Date : 2018-01-04 00:00:00 , DOI: 10.1021/acsomega.7b01443 Md Anamul Haque 1, 2 , Kei Mito 1 , Takayuki Kurokawa 1, 1 , Tasuku Nakajima 1, 1 , Takayuki Nonoyama 1, 1 , Muhammad Ilyas 1 , Jian Ping Gong 1, 1
Affiliation
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One-dimensional photonic crystals or multilayer films produce colors that change depending on viewing and light illumination angles because of the periodic refractive index variation in alternating layers that satisfy Bragg’s law. Recently, we have developed multilayered photonic hydrogels of two distinct bulk geometries that possess an alternating structure of a rigid polymeric lamellar bilayer and a ductile polyacrylamide (PAAm) matrix. In this paper, we focus on fabrication of composite gels with variable photonic band gaps by controlling the PAAm layer thickness. We report programmable angle-dependent and angle-independent structural colors produced by composite hydrogels, which is achieved by varying bulk and internal geometries. In the sheet geometry, where the lamellae are aligned parallel to the sheet surface, the photonic gel sheet exhibits strong angle-dependent colors. On the other hand, when lamellae are coaxially aligned in a cylindrical geometry, the gel rod exhibits an angle-independent color, in sharp contrast with the gel sheet. Rocking curves have been constructed to justify the diverse angle-dependent behavior of various geometries. Despite varying the bulk geometry, the tunable photonic gels exhibit strong mechanical performances and toughness. The distinct angle dependence of these tough photonic materials with variable band gaps could benefit light modulation in displays and sensor technologies.
中文翻译：
显示可编程角度相关颜色的坚韧可变带隙光子水凝胶
一维光子晶体或多层薄膜产生的颜色会根据观察角度和光照射角度而变化，因为交替层中的周期性折射率变化满足布拉格定律。最近，我们开发了两种不同体积几何形状的多层光子水凝胶，它们具有刚性聚合物层状双层和延性聚丙烯酰胺（PAAm）基质的交替结构。在本文中，我们重点关注通过控制 PAAm 层厚度来制造具有可变光子带隙的复合凝胶。我们报告了复合水凝胶产生的可编程角度依赖和角度无关结构颜色，这是通过改变体积和内部几何形状来实现的。在片材几何形状中，片层平行于片材表面排列，光子凝胶片材表现出强烈的角度依赖性颜色。另一方面，当薄片以圆柱形几何形状同轴排列时，凝胶棒表现出与角度无关的颜色，与凝胶片形成鲜明对比。摇摆曲线的构建是为了证明各种几何形状的不同角度相关行为的合理性。尽管体积几何形状发生变化，可调谐光子凝胶仍表现出强大的机械性能和韧性。这些具有可变带隙的坚韧光子材料的独特角度依赖性可能有利于显示器和传感器技术中的光调制。
更新日期：2018-01-04
中文翻译：
显示可编程角度相关颜色的坚韧可变带隙光子水凝胶
一维光子晶体或多层薄膜产生的颜色会根据观察角度和光照射角度而变化，因为交替层中的周期性折射率变化满足布拉格定律。最近，我们开发了两种不同体积几何形状的多层光子水凝胶，它们具有刚性聚合物层状双层和延性聚丙烯酰胺（PAAm）基质的交替结构。在本文中，我们重点关注通过控制 PAAm 层厚度来制造具有可变光子带隙的复合凝胶。我们报告了复合水凝胶产生的可编程角度依赖和角度无关结构颜色，这是通过改变体积和内部几何形状来实现的。在片材几何形状中，片层平行于片材表面排列，光子凝胶片材表现出强烈的角度依赖性颜色。另一方面，当薄片以圆柱形几何形状同轴排列时，凝胶棒表现出与角度无关的颜色，与凝胶片形成鲜明对比。摇摆曲线的构建是为了证明各种几何形状的不同角度相关行为的合理性。尽管体积几何形状发生变化，可调谐光子凝胶仍表现出强大的机械性能和韧性。这些具有可变带隙的坚韧光子材料的独特角度依赖性可能有利于显示器和传感器技术中的光调制。
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