Understanding the Self-Assembly of Cellulose Nanocrystals-Toward Chiral Photonic Materials
Understanding the Self-Assembly of Cellulose Nanocrystals-Toward Chiral Photonic Materials
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DOI：
10.1002/adma.201905876
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发表时间：
2020-02-03
影响因子：
29.4
通讯作者：
MacLachlan, Mark J.
中科院分区：
文献类型：
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作者：
Tran, Andy;Boott, Charlotte E.;MacLachlan, Mark J.
几百万年来，动物和植物进化出了复杂的分子和结构，赋予它们鲜艳的色彩。在自然着色的来源中，结构色在昆虫、鸟类羽毛、蛇皮、植物和其他生物中尤为突出，这些颜色是光与纳米级特征的相互作用而不是从色素中吸收而产生的。纤维素纳米晶体(CNCs)是一种生物可再生资源，它自发地组织成具有类似于节肢动物贝壳Bouligand结构的手性向列型液晶。数控薄膜周期性的手性向列结构导致它们衍射光，使它们看起来像彩虹一样。在过去的二十年里，在开发碳纳米管的光子特性方面取得了许多进展，应用范围从化妆品到传感器。本文讨论了碳纳米管的颜色来源、碳纳米管薄膜的光子性质控制、可产生柔性光子结构的新型碳纳米管复合材料的发展以及该领域的未来挑战。特别强调了利用碳纳米管制造柔性光子材料的最新努力。
Over millions of years, animals and plants have evolved complex molecules and structures that endow them with vibrant colors. Among the sources of natural coloration, structural color is prominent in insects, bird feathers, snake skin, plants, and other organisms, where the color arises from the interaction of light with nanoscale features rather than absorption from a pigment. Cellulose nanocrystals (CNCs) are a biorenewable resource that spontaneously organize into chiral nematic liquid crystals having a hierarchical structure that resembles the Bouligand structure of arthropod shells. The periodic, chiral nematic organization of CNC films leads them to diffract light, making them appear iridescent. Over the past two decades, there have been many advances to develop the photonic properties of CNCs for applications ranging from cosmetics to sensors. Here, the origin of color in CNCs, the control of photonic properties of CNC films, the development of new composite materials of CNCs that can yield flexible photonic structures, and the future challenges in this field are discussed. In particular, recent efforts to make flexible photonic materials using CNCs are highlighted.