The need for a precise regulation of the properties of chiral nematic structures in response to external stimuli is addressed. Self-assembled iridescent coatings are produced under the effect of electrostatic interactions between cellulose nanocrystals and poly(acrylic acid), endowing a high anisotropic dissymmetry (>0.3) and sensitivity to environmental humidity (13.1 nm/1% at 68–75% relative humidity, RH). The phenomena associated with shifts in selective light reflection (green to orange) and polarization, facilitate tunable transmitted colors (blue to orange) at given rotation angles (RA). Such properties are conveniently integrated into a “RH-RA-color” ternary code that is introduced as an anticounterfeiting technology, taking advantage of multicolor patterns that conveniently track with changes in RH and RA. The proposed charge-driven assembly opens new opportunities for chiral nematic materials that enable precise optical sensing and information encryption.

中文翻译：

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基于纤维素纳米晶体的手性向列涂层作为湿度传感和双重防伪的多重平台

解决了对响应外部刺激的手性向列结构特性进行精确调节的需求。自组装彩虹色涂层是在纤维素纳米晶体和聚（丙烯酸）之间的静电相互作用的作用下产生的，具有高度的各向异性不对称性（>0.3）和对环境湿度的敏感性（13.1 nm/1% at 68–75% 相对湿度, RH)。与选择性光反射（绿色到橙色）和偏振变化相关的现象有助于在给定的旋转角 (RA) 下实现可调谐的透射颜色（蓝色到橙色）。这些特性被方便地集成到作为防伪技术引入的“RH-RA 颜色”三元代码中，利用多色图案方便地跟踪 RH 和 RA 的变化。