Organic fluorescent materials with multistimuli-responsive behaviors have attracted much attention because of their promising applications in diverse fields.Most chromophores exhibit bright emission in either dilute s...Organic fluorescent materials with multistimuli-responsive behaviors have attracted much attention because of their promising applications in diverse fields.Most chromophores exhibit bright emission in either dilute solutions or aggregation states,which inevitably suffer from the aggregation-caused quenching(ACQ)problem or encounter serious energy loss at low concentration.To overcome these limitations,dual-state emissive(DSE)materials with bright emission in both solution and solid states have been developed.However,most DSE materials only involve one or two stimulus-responsive behaviors.Herein,through combining characteristics of imidazopyridine N1 as well as manipulation of electronic structure and intermolecular interaction,DSE molecule TPA-IPBA with four multistimuli-responsive behaviors has been rationally and accurately prepared,which could be easily converted to ACQ(TPA-IPB)and AIE(aggregation-induced emission)(TPA-IPBCN)molecules.Under external stimuli,four types of multistimuli-responsive behaviors have been successfully achieved,including solvatochromism(redshift of 124 nm),mechanofluorochromism(redshift of 6 or 30 nm),reversible tricolor acidichromism(redshift of 148 nm)and solidphase polymorphism with solvent-dependent solid emission(from B-state to G-state,redshift of 52 nm).We explained four types of multistimuli-responsive behaviors in detail through nuclear magnetic resonance spectroscopies,theoretical calculations,single crystal analysis,and PXRD characterization.In addition,on the basis of our biological research on imidazo[1,2-α]-pyridines,we found that TPA-IPBA serves as a fluorescent probe to dynamically detect biological lipid droplets with high co-localization ability(PC=0.95).These results provide new insight into developing DSE materials via a delicate manipulation of molecular structure with acceptor-dependent tunable multistimuli-responsive properties and bioimaging applications.展开更多
Currently,numerous biomimetic robots inspired by natural biological systems have been developed.However,creating soft robots with versatile locomotion modes remains a significant challenge.Snakes,as invertebrate repti...Currently,numerous biomimetic robots inspired by natural biological systems have been developed.However,creating soft robots with versatile locomotion modes remains a significant challenge.Snakes,as invertebrate reptiles,exhibit diverse and powerful locomotion abilities,including prey constriction,sidewinding,accordion locomotion,and winding climbing,making them a focus of robotics research.In this study,we present a snake-inspired soft robot with an initial coiling structure,fabricated using MXene-cellulose nanofiber ink printed on pre-expanded polyethylene film through direct ink writing technology.The controllable fabrication of initial coiling structure soft robot(ICSBot)has been achieved through theoretical calculations and finite element analysis to predict and analyze the initial structure of ICSBot,and programmable ICSBot has been designed and fabricated.This robot functions as a coiling gripper capable of grasping objects with complex shapes under near infrared light stimulation.Additionally,it demonstrates multi-modal crawling locomotion in various environments,including confined spaces,unstructured terrains,and both inside and outside tubes.These results offer a novel strategy for designing and fabricating coiling-structured soft robots and highlight their potential applications in smart and multifunctional robotics.展开更多
基金supported by the National Natural Science Foundation of China(21803059,22401267)the Training Program for Young Backbone Teachers in Higher Education Institutions of Henan Province(2024GGJS011)the Natural Science Foundation of Henan Province(252300421282)。
文摘Organic fluorescent materials with multistimuli-responsive behaviors have attracted much attention because of their promising applications in diverse fields.Most chromophores exhibit bright emission in either dilute solutions or aggregation states,which inevitably suffer from the aggregation-caused quenching(ACQ)problem or encounter serious energy loss at low concentration.To overcome these limitations,dual-state emissive(DSE)materials with bright emission in both solution and solid states have been developed.However,most DSE materials only involve one or two stimulus-responsive behaviors.Herein,through combining characteristics of imidazopyridine N1 as well as manipulation of electronic structure and intermolecular interaction,DSE molecule TPA-IPBA with four multistimuli-responsive behaviors has been rationally and accurately prepared,which could be easily converted to ACQ(TPA-IPB)and AIE(aggregation-induced emission)(TPA-IPBCN)molecules.Under external stimuli,four types of multistimuli-responsive behaviors have been successfully achieved,including solvatochromism(redshift of 124 nm),mechanofluorochromism(redshift of 6 or 30 nm),reversible tricolor acidichromism(redshift of 148 nm)and solidphase polymorphism with solvent-dependent solid emission(from B-state to G-state,redshift of 52 nm).We explained four types of multistimuli-responsive behaviors in detail through nuclear magnetic resonance spectroscopies,theoretical calculations,single crystal analysis,and PXRD characterization.In addition,on the basis of our biological research on imidazo[1,2-α]-pyridines,we found that TPA-IPBA serves as a fluorescent probe to dynamically detect biological lipid droplets with high co-localization ability(PC=0.95).These results provide new insight into developing DSE materials via a delicate manipulation of molecular structure with acceptor-dependent tunable multistimuli-responsive properties and bioimaging applications.
基金supported by the National Key R&D Program of China(NO.2024YFB3409900)the China Postdoctoral Science Foundation(NO.2023M730845)the Heilongjiang Postdoctoral Fund(NO.LBH-Z23182)。
文摘Currently,numerous biomimetic robots inspired by natural biological systems have been developed.However,creating soft robots with versatile locomotion modes remains a significant challenge.Snakes,as invertebrate reptiles,exhibit diverse and powerful locomotion abilities,including prey constriction,sidewinding,accordion locomotion,and winding climbing,making them a focus of robotics research.In this study,we present a snake-inspired soft robot with an initial coiling structure,fabricated using MXene-cellulose nanofiber ink printed on pre-expanded polyethylene film through direct ink writing technology.The controllable fabrication of initial coiling structure soft robot(ICSBot)has been achieved through theoretical calculations and finite element analysis to predict and analyze the initial structure of ICSBot,and programmable ICSBot has been designed and fabricated.This robot functions as a coiling gripper capable of grasping objects with complex shapes under near infrared light stimulation.Additionally,it demonstrates multi-modal crawling locomotion in various environments,including confined spaces,unstructured terrains,and both inside and outside tubes.These results offer a novel strategy for designing and fabricating coiling-structured soft robots and highlight their potential applications in smart and multifunctional robotics.
