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Schizophrenic Shape Memory Hydrogel with Hidden Morphological Information for Transient Encryption

Jianlei Lu,Chujun Ni,Xin Wen,Xin Guan,Baoyi Wu,Nan Hai,Yang Li,Jiawei Zhang

Inspired by sign language, responsive materials construct an efficient encryption channel via programmable shape morphing, offering a potential solution to the decryption vulnerabilities of existing optical anticounterfeit. However, these pioneering approaches often fail to conceal morphological information due to predictable shape-shifting, let alone achieve higher-level encryption such as multiple and transient information storage. Herein, we report a schizophrenic shape memory hydrogel that can be applied for transient information encryption. In particular, two opposite shape fixation mechanisms, heating-induced aggregation of poly(acrylic acid)-Ca2+ (PAAc-Ca2+) coordination and cooling-induced clustering of alkyl chain-modified poly(vinyl alcohol) (PVA-C6), are coupled in one system. Through a two-step shape programming process involving alternating heating and cooling, complex morphological information can be hidden within an initially simple shape. During its temperature-triggered shape morphing process, the hydrogel rapidly undergoes shape-shifting to reveal the hidden morphological information, followed by an onset recovery to erase it, thereby achieving a transient information display. This single-triggered multiple shape-shifting system opens an unprecedented pattern-independent channel for existing encryption strategies and can motivate the development of advanced anticounterfeiting materials with integrated multifunctionality.