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Re-Printable Chiral Photonic Paper with Invisible Patterns and Tunable Wettability

机译：可重新打印手性光子纸，具有隐形图案和可调润湿性

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摘要

The construction of invisible patterns via high-resolution printing and the independent encoding/decoding of complex information can lead to promising applications in steganography and watermarking for optical encryption. Herein, a rewritable chiral photonic paper formed by cholesteric cellulose nanocrystals and polycation is reported. The chemically crosslinked polycation network interpenetrates in the cholesteric structure while retaining the optical properties of the photonic crystals. The film exhibits controllable wettability via anion exchange, leading to extremely low contrast in the dry state but high contrast by a rapid wetting response. Triple invisible information is independently encoded on the films, including invisible patterns caused by reversible counterion-controlled wettability, permanent fluorescent labels based on fluorescent counterions, and polarization-dependent structural colors based on cholesteric structures. Full color patterns can be reversibly constructed via inkjet printing, with a high resolution of 100 mu m. In addition, the circular polarization characteristics of the cellulose nanocrystals, liquid crystals, endow the system with complex and independent responses, realizing a wetting/polarization double-key decryption. This work provides a simple and effective optical technique for coding complex information on a single material platform and expands the techniques available to achieve invisible patterns for sensing and anti-counterfeiting.
机译：通过高分辨率打印和复杂信息的独立编码/解码构造无形模式可以导致隐写术和用于光学加密的水印的有希望的应用。这里，报道了通过胆纤维纤维素纳米晶体形成的可重写手性光子纸和聚晶。化学交联的洋地化网络在胆甾型结构中渗入胆甾型结构，同时保持光子晶体的光学性质。该薄膜通过阴离子交换表现出可控润湿性，导致干燥状态下的极低对比度，但通过快速润湿反应，对比度高。三重隐形信息在薄膜上独立编码，包括由可逆抗衡控制控制润湿性，基于荧光抗衡离子的永久荧光标签引起的无形模式，以及基于胆甾结构的偏振依赖性结构颜色。全彩色图案可通过喷墨印刷可逆地构造，高分辨率为100亩。另外，纤维素纳米晶体，液晶的圆偏振特性，赋予系统具有复杂和独立的反应，实现润湿/偏振双关键解密。这项工作提供了一种简单有效的光学技术，用于编码在单个材料平台上的复杂信息，并扩展可用于实现感应和防伪的无形模式的技术。

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  • 来源
    《Advanced Functional Materials》 |2021年第16期|2009916.1-2009916.9|共9页
  • 作者

    Chen Ruilian; Feng Dengchong; Chen Guojian; Chen Xudong; Hong Wei;

  • 作者单位

    Sun Yat Sen Univ Guangdong Engn Technol Res Ctr High Performance O Sch Chem Key Lab Polymer Composite & Funct Mat Minist Educ Guangzhou 510275 Peoples R China;

    Sun Yat Sen Univ Guangdong Engn Technol Res Ctr High Performance O Sch Chem Key Lab Polymer Composite & Funct Mat Minist Educ Guangzhou 510275 Peoples R China;

    Sun Yat Sen Univ Guangdong Engn Technol Res Ctr High Performance O Sch Chem Key Lab Polymer Composite & Funct Mat Minist Educ Guangzhou 510275 Peoples R China;

    Sun Yat Sen Univ Guangdong Engn Technol Res Ctr High Performance O Sch Chem Key Lab Polymer Composite & Funct Mat Minist Educ Guangzhou 510275 Peoples R China;

    Sun Yat Sen Univ Guangdong Engn Technol Res Ctr High Performance O Sch Chem Key Lab Polymer Composite & Funct Mat Minist Educ Guangzhou 510275 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    anti#8208; counterfeiting; cellulose nanocrystals; chiral photonic crystals; invisible patterning; wettability;

    机译：抗＆＃8208;假冒;纤维素纳米晶体;手性光子晶体;隐形图案;润湿性;

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