Pressure/Temperature Dual-Responsive Cellulose Nanocrystal Hydrogels for On-Demand Schemochrome Patterning,Advanced Functional Materials

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Pressure/Temperature Dual-Responsive Cellulose Nanocrystal Hydrogels for On-Demand Schemochrome Patterning
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-07-26 , DOI: 10.1002/adfm.202306208
Xinkai Li ₁ , Jize Liu ₁ , Xinxing Zhang ₁

Affiliation

Cellulose nanocrystal (CNC) based optical devices with adjustable schemochrome have attracted immense interest. However, most of the previously reported structural colored CNC-based materials can only achieve simple stress-induced color change, which have difficulty achieving multimode control of complex patterning that can be accurately identified. Here, inspired by the nanostructure-based color-changing mechanism of neon tetra, this study presents a pressure/temperature dual-responsive CNC-based schemochrome hydrogel with adjustable dynamic chiral nematic structure. By incorporating abundant interfacial noncovalent interactions, dynamic correlations between adjustable helical pitch of the vertically stacked cholesteric liquid crystalline (LC) phase and responsiveness of flexible thermosensitive substrate are established, which further enable wide-range optical characteristic (12°–213° in HSV color model and 421–734 nm in the UV–Vis spectra) and identifiable visualized patterning. The resultant hydrogels are applied in proof-of-concept demonstrations of on-demand schemochrome patterning, including customizable patterned dual-encryption label, smart digital display, temperature monitor, and intelligent recognition/control system. This study envisages that the bioinspired construction of structural colored nanomaterials will have promising applications in smart responsive photonic equipment including smart display, anticounterfeiting, and intelligent control systems.

中文翻译：

用于按需模式色素图案化的压力/温度双响应纤维素纳米晶体水凝胶

基于纤维素纳米晶体（CNC）的具有可调节图式色素的光学器件引起了人们的极大兴趣。然而，此前报道的结构彩色数控材料大多只能实现简单的应力诱导颜色变化，难以实现可准确识别的复杂图案的多模式控制。在这里，受 Neon tetra 基于纳米结构的变色机制的启发，本研究提出了一种具有可调节动态手性向列结构的基于压力/温度双响应 CNC 的图式色素水凝胶。通过结合丰富的界面非共价相互作用，建立了垂直堆叠胆甾液晶（LC）相的可调螺距与柔性热敏基板的响应性之间的动态相关性，这进一步实现了宽范围的光学特性（HSV颜色为12°–213°）模型和紫外-可见光谱中的 421-734 nm）和可识别的可视化图案。所得水凝胶应用于按需模式色素图案的概念验证演示，包括可定制图案双加密标签、智能数字显示器、温度监视器和智能识别/控制系统。这项研究设想，结构彩色纳米材料的仿生构造将在智能响应光子设备（包括智能显示、防伪和智能控制系统）中具有广阔的应用前景。

更新日期：2023-07-26

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