Conformational flexibility is essential to the stimuli-responsive property of organic materials,but achieving the reversible molecular transformation is still challenging in functional materials for the high energy ba...Conformational flexibility is essential to the stimuli-responsive property of organic materials,but achieving the reversible molecular transformation is still challenging in functional materials for the high energy barriers and restriction by intermolecular interactions.Herein,through the incorporation of various steric hindrances into phenothiazine derivatives with different positions and quantities to tune the molecular conformations by adjustable repulsive forces,the folded angles gradually changed from 180°to 90°in 17 compounds.When the angle located at 112°with moderated steric effect,dynamic and reversible transformation of conformations under mechanical force has been achieved for the low energy barriers and mutually regulated molecular motions,resulting in both selfrecoverable and stimuli-responsive phosphorescence properties for the first time.It opened up a new way to realize the self-recovery property of organic materials,which can facilitate the multi-functional property of smart materials with the opened avenue for other fields with inspiration.展开更多
Magnetic soft robots have the characteristics of small size,noncable drive,and motion agility,which are suitable for medical operations in the gastrointestinal tract.However,multiangle folding and reconfigurable magne...Magnetic soft robots have the characteristics of small size,noncable drive,and motion agility,which are suitable for medical operations in the gastrointestinal tract.However,multiangle folding and reconfigurable magnetization have yet to be fully investigated,and thus,the study of magnetic soft robots with morphological changes and medical functions is still challenging.To this end,we propose a magnetic soft sheet robot based on the magnetorheological fluids,which presents a remarkable capability for reversible folding motion,rapid real-time reconfigurable magnetization,and targeted drug delivery functions.Furthermore,the robot has a fully soft sheet structure that is not magnetized in a zero magnetic field.After folding,the surface area of the soft sheet robot can be reduced to one third of its original area to cope with the complex gastrointestinal cavities.Five kinds of soft sheet robot prototypes with different magnetic driving abilities are fabricated,and the movement experiments of these robots are carried out on a smooth surface,a flexible fluff surface,a slope surface,underwater,and under load,respectively.The influence mechanisms of different magnetic field strengths and frequencies on robot movement are analyzed.The effectiveness of the proposed scheme is verified by ex vivo porcine stomach experiments and ultrasonic detection.展开更多
基金supported by the National Natural Science Foundation of China(22122504,22235006)Foundation of Hubei Scientific Committee(2022BAA015 and 2022EHB010).
文摘Conformational flexibility is essential to the stimuli-responsive property of organic materials,but achieving the reversible molecular transformation is still challenging in functional materials for the high energy barriers and restriction by intermolecular interactions.Herein,through the incorporation of various steric hindrances into phenothiazine derivatives with different positions and quantities to tune the molecular conformations by adjustable repulsive forces,the folded angles gradually changed from 180°to 90°in 17 compounds.When the angle located at 112°with moderated steric effect,dynamic and reversible transformation of conformations under mechanical force has been achieved for the low energy barriers and mutually regulated molecular motions,resulting in both selfrecoverable and stimuli-responsive phosphorescence properties for the first time.It opened up a new way to realize the self-recovery property of organic materials,which can facilitate the multi-functional property of smart materials with the opened avenue for other fields with inspiration.
基金The support of the National Natural Science Foundation of China(52405081,52575080)the Natural Science Foundation of Jiangsu Province(BK20231066)the Joint Funds of the National Natural Science Foundation of China(U24A20116)in carrying out this research is gratefully acknowledged.
文摘Magnetic soft robots have the characteristics of small size,noncable drive,and motion agility,which are suitable for medical operations in the gastrointestinal tract.However,multiangle folding and reconfigurable magnetization have yet to be fully investigated,and thus,the study of magnetic soft robots with morphological changes and medical functions is still challenging.To this end,we propose a magnetic soft sheet robot based on the magnetorheological fluids,which presents a remarkable capability for reversible folding motion,rapid real-time reconfigurable magnetization,and targeted drug delivery functions.Furthermore,the robot has a fully soft sheet structure that is not magnetized in a zero magnetic field.After folding,the surface area of the soft sheet robot can be reduced to one third of its original area to cope with the complex gastrointestinal cavities.Five kinds of soft sheet robot prototypes with different magnetic driving abilities are fabricated,and the movement experiments of these robots are carried out on a smooth surface,a flexible fluff surface,a slope surface,underwater,and under load,respectively.The influence mechanisms of different magnetic field strengths and frequencies on robot movement are analyzed.The effectiveness of the proposed scheme is verified by ex vivo porcine stomach experiments and ultrasonic detection.
