Preparation And Secure Information Storage Of Fluorescent Soft Materials Based On EuW₁₀

With the explosion of big data,the security of information is paramount.At present,the application of stimuli-responsive soft materials such as functional films and hydrogels in the field of information storage has attracted much attention.In particular,stimuli-responsive luminescent soft materials have become the preferred materials for information security storage due to their extremely high concealment.However,how to construct low-cost,reusable,environmentally friendly,and high information security polyoxometalate-based luminescent soft materials is still an important challenge in this field.Therefore,in this paper,the controllable construction of stimuli-responsive luminescent soft materials based on luminescent polyoxometalates and their applications in the field of information security storage are realized by using Na₉EuW₁₀O₃₆(EuW₁₀)with excellent luminescence properties as the basic unit.The main research contents are as follows:First,by introducing the luminescent polyoxometalate EuW₁₀ into gelatin/glycerol,a luminescent film with high transparency,high strength and high flexibility was prepared by solution casting method.Based on the association and dissociation of hydrogen bonds between glycerol and water molecules,the reversible luminescent switching of the film was realized,and it is further applied to water-jet rewritable security printing.The printed information can be printed again after being"erased"by heating.In addition,the film has excellent rewritable and erasable properties,as well as good regeneration ability and low toxicity.This work provides a new idea for the preparation of rewritable luminescent security printing films from the aspects of reducing cost,simplifying the preparation process and protecting the environment.Second,in order to further improve the security of information storage,a dual-network luminescent hydrogel was constructed by the introduction of a rigid polyacrylamide network.The hydrogel exhibits reversible luminescence switching properties under the stimulation of acid/base,metal ion/disodium EDTA,and can be used for reversible storage and erasing of information.In addition,the hydrogel also possesses temperature-induced shape memory and self-healing properties.Through the optimized design of the encryption/decryption strategy,the dual stimulus response characteristics,shape memory,and self-healing characteristics are combined to effectively improve the security of information storage.The multifunctional luminescent hydrogel has broad application prospects in the field of advanced information security storage.In this paper,using EuW₁₀ as a luminescent moiety,through optimization of different component ratios,stimuli-responsive luminescent films and luminescent hydrogels that can be used for reversible and safe information storage were constructed.And by introducing shape memory and self-healing functions,the security of information storage is improved.It plays an important role in promoting the application of luminescent polyoxometalates in the field of information security storage.