Biomimetic Chiral Photonic Materials with Tunable Metallic Colorations Prepared from Chiral Melanin-like Nanorods for UV Shielding, Humidity Sensing, and Cosmetics,Langmuir

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Biomimetic Chiral Photonic Materials with Tunable Metallic Colorations Prepared from Chiral Melanin-like Nanorods for UV Shielding, Humidity Sensing, and Cosmetics
Langmuir ( IF 3.7 ) Pub Date : 2022-06-22 , DOI: 10.1021/acs.langmuir.2c01004
Ke Xia ₁ , Xiaonan Zheng ₁ , Yuhan Wang ₁ , Weiting Zhong ₁ , Ziyue Dong ₁ , Zihan Ye ₁ , Zhenkun Zhang ₁

Affiliation

Many biological species combine the helical organization of cellulose or chitin microfibrils with broadband light absorption of black melanin to produce brilliant structural colors with metallic and glossy effects and other diverse functions. In this work, based on core–shell CNC@PDA chiral nanorods consisting of cellulose nanocrystals (CNCs) as the core and melanin-like polydopamine (PDA) as the shell that can form well-defined chiral liquid crystal phases, we report chiral photonic materials that closely mimic the unique coloration mechanisms and functionalities mastered by several biological species. The photonic films formed by such single CNC@PDA nanorods have brilliant iridescent structural colors originating from selective reflection of circularly polarized lights by the helical organization of CNC@PDAs across the films. Furthermore, the colors of such films have background-independent brightness, high visibility, and metallic effects that arise from the light absorption of the PDA component. Especially, the color ranges and metallic effects of the films can be conveniently tuned by varying the thickness of the PDA shell. In addition, the UV absorption and hygroscopic properties of PDA endow these CNC@PDA films with efficient broadband UV shielding and sensitive humidity-induced dynamic color changes. Due to the mussel-like superior adhesion of PDA, CNC@PDA-based photonic coatings can be formed conformably onto diverse kinds of substrates. A shiny eye shadow with viewing angle-dependent colorful patterns was used to demonstrate the potential applications. With combinations of multiple unique properties in one photonic material fabricated from a single building block, these CNC@PDA-based films are expected to have potential applications in cosmetics, UV protection, anticounterfeiting, chiral reflectors, etc.

中文翻译：

由手性黑色素类纳米棒制备的具有可调金属着色的仿生手性光子材料，用于紫外线屏蔽、湿度传感和化妆品

许多生物物种将纤维素或几丁质微纤维的螺旋组织与黑色黑色素的宽带光吸收相结合，以产生具有金属和光泽效果以及其他多种功能的明亮结构颜色。在这项工作中，基于核壳型 CNC@PDA 手性纳米棒，以纤维素纳米晶体 (CNCs) 为核，类黑色素聚多巴胺 (PDA) 为壳，可以形成明确的手性液晶相，我们报告了手性光子密切模仿几种生物物种掌握的独特着色机制和功能的材料。由这种单一的 CNC@PDA 纳米棒形成的光子薄膜具有明亮的虹彩结构颜色，这是由于 CNC@PDA 在薄膜上的螺旋组织对圆偏振光的选择性反射而产生的。此外，这种薄膜的颜色具有与背景无关的亮度、高可见度和由 PDA 组件的光吸收产生的金属效果。特别是，可以通过改变 PDA 外壳的厚度来方便地调整薄膜的颜色范围和金属效果。此外，PDA 的紫外吸收和吸湿特性赋予这些 CNC@PDA 薄膜有效的宽带紫外屏蔽和敏感的湿度引起的动态颜色变化。由于 PDA 具有类似贻贝的优异粘附性，基于 CNC@PDA 的光子涂层可以在各种基材上形成顺应性。具有与视角相关的彩色图案的闪亮眼影被用来展示潜在的应用。在由单个构件制成的一种光子材料中结合了多种独特的特性，

更新日期：2022-06-22

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