To realize single-stimulus-induced simultaneous multi-behaviors in hydrogels is still quite challenging nowadays.Herein,an intelli gent pH-responsive hydrogel(BP4VA/PAS)with rapid and high contrast changes in color,fl...To realize single-stimulus-induced simultaneous multi-behaviors in hydrogels is still quite challenging nowadays.Herein,an intelli gent pH-responsive hydrogel(BP4VA/PAS)with rapid and high contrast changes in color,fluorescence,and shape simultaneously is reported The BP4VA/PAS hydrogel is fabricated by incorporating styryl anthracene derivative(BP4VA)into copolymer networks(PAS)of acrylamide and sodium 4-styrene sulfonate.Under acid conditions,the protonation of BP4VA generates a rapid change with high color contrast from yellow to red and a fluorescence switch between bright green and weak red emission.At the same time,the electrostatic interactions between 2H-BP4VA^(2+)and sulfonate anions suspended on PAS trigger BP4VA/PAS hydrogels to shrink.Upon alkaline treatment,the 2H-BP4VA^(2+)/PAS hydrogel deproto nates and recovers to its original color,fluorescence,and shape.Furthermore,utilizing rapid and remarkable pH-responsive properties o BP4VA/PAS hydrogels,we successfully demonstrated its applications in biomimicry,camouflage,and multistage information encryption.Collec tively,this work provided an elegant strategy to develop intelligent hydrogels in applications of biomimetic smart materials and information en cryption.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.51373025 and 22005021)Beijing Natural Science Foundation(No.2242044)+2 种基金the Fundamental Research Funds for the Central Universities(No.FRF-TP-22-003A1)China Postdoctoral Science Foundation(No.2023M730311)the Program for New Century Excellent Talents in University(No.NCET-11-0582)。
文摘To realize single-stimulus-induced simultaneous multi-behaviors in hydrogels is still quite challenging nowadays.Herein,an intelli gent pH-responsive hydrogel(BP4VA/PAS)with rapid and high contrast changes in color,fluorescence,and shape simultaneously is reported The BP4VA/PAS hydrogel is fabricated by incorporating styryl anthracene derivative(BP4VA)into copolymer networks(PAS)of acrylamide and sodium 4-styrene sulfonate.Under acid conditions,the protonation of BP4VA generates a rapid change with high color contrast from yellow to red and a fluorescence switch between bright green and weak red emission.At the same time,the electrostatic interactions between 2H-BP4VA^(2+)and sulfonate anions suspended on PAS trigger BP4VA/PAS hydrogels to shrink.Upon alkaline treatment,the 2H-BP4VA^(2+)/PAS hydrogel deproto nates and recovers to its original color,fluorescence,and shape.Furthermore,utilizing rapid and remarkable pH-responsive properties o BP4VA/PAS hydrogels,we successfully demonstrated its applications in biomimicry,camouflage,and multistage information encryption.Collec tively,this work provided an elegant strategy to develop intelligent hydrogels in applications of biomimetic smart materials and information en cryption.
