Wang Hong-Qin, Tang Yuqi, Huang Zi-Yang, Wang Fang-Zhou, Qiu Peng-Fei, Zhang Xinfang, Li Cheng-Hui, Li Quan
State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, 210023, Nanjing, China.
Institute of Advanced Materials and School of Chemistry and Chemical Engineering, Southeast University, 211189, Nanjing, China.
Angew Chem Int Ed Engl. 2023 Nov 27;62(48):e202313728. doi: 10.1002/anie.202313728. Epub 2023 Oct 23.
Information security has gained increasing attention in the past decade, leading to the development of advanced materials for anti-counterfeiting, encryption and instantaneous information display. However, it remains challenging to achieve high information security with simple encryption procedures and low-energy stimuli. Herein, a series of strain/temperature-responsive liquid crystal elastomers (LCEs) are developed to achieve dual-modal, multi-level information encryption and real-time, rewritable transient information display. The as-prepared polydomain LCEs can change from an opaque state to a transparent state under strain or temperature stimuli, with the transition strains or temperatures highly dependent on the concentration of long-chain flexible spacers. Information encrypted by different LCE inks can be decrypted under specific strains or temperatures, leading to multi-level protection of information security. Furthermore, with the combination of the phase transition of polydomain LCEs and the photothermal effect of multi-walled carbon nanotubes (MWCNTs), we achieved a repeatable transient information display by using near-infrared (NIR) light as a pen for writing. This study provides new insight into the development of advanced encryption materials with versatility and high security for broad applications.
在过去十年中，信息安全受到了越来越多的关注，这推动了用于防伪、加密和即时信息显示的先进材料的发展。然而，通过简单的加密程序和低能量刺激来实现高信息安全仍然具有挑战性。在此，我们开发了一系列应变/温度响应型液晶弹性体（LCE），以实现双模式、多级信息加密以及实时、可重写的瞬态信息显示。所制备的多畴LCE在应变或温度刺激下可从不透明状态转变为透明状态，其转变应变或温度高度依赖于长链柔性间隔基的浓度。由不同LCE墨水加密的信息可在特定应变或温度下解密，从而实现对信息安全的多级保护。此外，通过将多畴LCE的相变与多壁碳纳米管（MWCNT）的光热效应相结合，我们使用近红外（NIR）光作为书写笔实现了可重复的瞬态信息显示。这项研究为开发具有多功能性和高安全性的先进加密材料以用于广泛应用提供了新的见解。
