Revealing the Structural Coloration of Self-Assembled Chitin Nanocrystal Films,Advanced Materials

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Revealing the Structural Coloration of Self-Assembled Chitin Nanocrystal Films
Advanced Materials ( IF 27.4 ) Pub Date : 2022-05-27 , DOI: 10.1002/adma.202203300
Aurimas Narkevicius ₁ , Richard M Parker ₁ , Jordi Ferrer-Orri ₁ , Thomas G Parton ₁ , Zihao Lu ₁ , Gea T van de Kerkhof ₁ , Bruno Frka-Petesic ₁ , Silvia Vignolini ₁

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The structural coloration of arthropods often arises from helicoidal structures made primarily of chitin. Although it is possible to achieve analogous helicoidal architectures by exploiting the self-assembly of chitin nanocrystals (ChNCs), to date no evidence of structural coloration has been reported from such structures. Previous studies are identified to have been constrained by both the experimental inability to access sub-micrometer helicoidal pitches and the intrinsically low birefringence of crystalline chitin. To expand the range of accessible pitches, here, ChNCs are isolated from two phylogenetically distinct sources of α-chitin, namely fungi and shrimp, while to increase the birefringence, an in situ alkaline treatment is performed, increasing the intensity of the reflected color by nearly two orders of magnitude. By combining this treatment with precise control over ChNC suspension formulation, structurally colored chitin-based films are demonstrated with reflection tunable from blue to near infrared.

中文翻译：

揭示自组装几丁质纳米晶膜的结构着色

节肢动物的结构着色通常来自主要由几丁质制成的螺旋结构。尽管可以通过利用几丁质纳米晶体（ChNCs）的自组装来实现类似的螺旋结构，但迄今为止尚未报告此类结构的结构着色的证据。先前的研究被确定受到实验无法获得亚微米螺旋间距和结晶几丁质固有的低双折射的限制。为了扩大可接近的间距范围，这里从 α 几丁质的两个系统发育不同的来源（即真菌和虾）中分离出 ChNC，同时为了增加双折射，进行了原位碱性处理，将反射颜色的强度增加了近两个数量级。通过将这种处理与对 ChNC 悬浮液配方的精确控制相结合，展示了结构着色的几丁质基薄膜，其反射可从蓝色调整到近红外。

更新日期：2022-05-27

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