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首页> 外文期刊>Advanced Materials >Retrieving the Coassembly Pathway of Composite Cellulose Nanocrystal Photonic Films from their Angular Optical Response
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Retrieving the Coassembly Pathway of Composite Cellulose Nanocrystal Photonic Films from their Angular Optical Response

机译：从它们的角度光学响应检索复合纤维素纳米晶体光子膜的合作途径

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摘要

Aqueous suspensions of cellulose nanocrystals (CNCs) are known to self-assemble into a chiral nematic liquid crystalline phase, leading to solid-state nanostructured colored films upon solvent evaporation, even in the presence of templating agents. The angular optical response of these structures, and therefore their visual appearance, are completely determined by the spatial arrangement of the CNCs when the drying suspension undergoes a transition from a flowing and liquid crystalline state to a kinetically arrested state. Here, it is demonstrated how the angular response of the final film allows for retrieval of key physical properties and the chemical composition of the suspension at the onset of the kinetic arrest, thus capturing a snapshot of the past. To illustrate this methodology, a dynamically evolving sol-gel coassembly process is investigated by adding various amounts of organosilica precursor, namely, 1,2-bis(trimethoxysilyl)ethane. The influence of organosilica condensation on the kinetic arrest can be tracked and thus explains the angular response of the resulting films. The a posteriori and in situ approach is general; it can be applied to a variety of additives in CNC-based films and it allows access to key rheological information of the suspension without using any dedicated rheological technique.
机译：已知纤维素纳米晶体（CNC）的水性悬浮液将自组装成手性型液晶相，导致固态纳米结构染色薄膜，即使在模板的存在下也是在溶剂蒸发时。这些结构的角度光学响应，因此它们的视觉外观完全由CNC的空间布置完全决定，当干燥悬浮液经历从流动和液晶状态到动力学上被动状态时。这里，证明了最终膜的角度响应如何在动力学阻滞开始时允许检索关键物理性质和悬浮液的化学成分，从而捕获过去的快照。为了说明该方法，通过加入各种量的有机硅前体，即1,2-双（三甲氧基甲硅烷基）乙烷来研究动态演化的溶胶 - 凝胶配合方法。可以跟踪有机硅缩合对动力学阻滞的影响，从而解释了所得薄膜的角度响应。一般和原位方法是一般的;它可以应用于基于CNC的薄膜中的各种添加剂，并且允许在不使用任何专用流变技术的情况下访问悬浮液的关键流变信息。

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