Surface Sensing Of Recyclable Stimuli-responsive Polymer Gels

Stimuli-responsive polymer gel is a kind of "smart" macromolecular cross-linking system,which is widely used in many fields such as biomedicine,nanotechnology,physical and chemical sensing,flexible devices and so on due to its excellent mechanical properties and various responsiveness.However,the development of stimuli-responsive polymer gel devices with highly reversible responses,controllable programming,and visual high-precision surface patterning still faces great challenges.In this paper,two visual,reversible cycling,program-controlled stimuli-response strategies and smart gel materials prepared by organic synthesis are discussed.The crosslinking fluoro-network（CFN）organogel was prepared by epoxy crosslinking with polyfluoro aromatic ring structure and long carbon chain.The structure of CFN endows the organogel with the ability to swell a variety of organic solvents in situ and enables it to deform in a controlled,rapid,and tireless manner.Utilizing the in-situ swelling properties of CFN gels to realize visual program-controlled deformation and sensing.PAm/PBACA/Ag NPs/PNASS hydrogels were prepared by radical polymerization of inorganic silver nanoparticles and organic ligand monomers.By realizing the localized surface plasmon resonance（LSPR）color changing function of Ag NPs through a photocontrolled coordination switching mechanism,a protocol for information writing,storage,and self-erasing on hydrogel surfaces was developed.The gel response mechanism was studied by molecular modeling and kinetic characterization,and a visualized reversible stimulus-response cycle was realized by in situ swelling and light-controlled coordination switching.Combined with the excellent mechanical properties of gel materials to explore their application potential as surface sensing,information storage,encryption-decryption.