Controlling the Photonic Properties of Cholesteric Cellulose Nanocrystal Films with Magnets
Controlling the Photonic Properties of Cholesteric Cellulose Nanocrystal Films with Magnets
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DOI：
10.1002/adma.201701469
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发表时间：
2017-08-25
影响因子：
29.4
通讯作者：
Vignolini, Silvia
中科院分区：
文献类型：
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作者：
Frka-Petesic, Bruno;Guidetti, Giulia;Vignolini, Silvia
纤维素纳米晶的自组装是制备具有手性光学响应的生物源光子薄膜的有效方法。虽然已经利用各种技术来调节这种系统的光学特性，但尚未报道外场的存在来显著改变它们的光学特性。在这项工作中，通过使用小型商用磁体(约0.5-1.2T)，胆甾相磁畴的取向能够在它们组装成薄膜时在悬浮中进行调节。对这些薄膜的详细分析表明，它们的角度响应得到了前所未有的控制。这一简单而强大的技术在设计这类彩虹膜的视觉外观方面开启了新的可能性，从金属到像素化或哑光纹理，为涂料、化妆品和安全标签中真正可持续的光子颜料的开发铺平了道路。
The self-assembly of cellulose nanocrystals is a powerful method for the fabrication of biosourced photonic films with a chiral optical response. While various techniques have been exploited to tune the optical properties of such systems, the presence of external fields has yet to be reported to significantly modify their optical properties. In this work, by using small commercial magnets (approximate to 0.5-1.2 T) the orientation of the cholesteric domains is enabled to tune in suspension as they assemble into films. A detailed analysis of these films shows an unprecedented control of their angular response. This simple and yet powerful technique unlocks new possibilities in designing the visual appearance of such iridescent films, ranging from metallic to pixelated or matt textures, paving the way for the development of truly sustainable photonic pigments in coatings, cosmetics, and security labeling.