The design and fabrication of advanced soft actuators with programmable actuation are highly desirable in constructing intelligent soft robots.In this work,a programmable light-driven liquid crystalline network(LCN)-b...The design and fabrication of advanced soft actuators with programmable actuation are highly desirable in constructing intelligent soft robots.In this work,a programmable light-driven liquid crystalline network(LCN)-based soft actuator was judiciously designed and prepared by constructing structural anisotropy across the thickness of the film.A three-dimensional(3D)deformable LCN actuator was realized by polymerization-induced phase separation of small-molarweight monomers and polymer networks.The resultant anisotropic LCN displays anisotropic microscale nanoporous architecture across the thickness in addition to uniform alignment at the molecular scale.The actuation behaviors of LCN film are tunable by adjusting the size and distribution of nanopores in LCN bulk via changing polymerization conditions and monomer components.More importantly,the nanoporous LCN film can be harnessed as a promising template to achieve diverse light responsiveness by changing the photothermal dyes via a feasible washing and refilling process,demonstrating a reprogrammable light-driven soft actuator.展开更多
Inspired by nature,dynamic self-organized helical superstructures are becoming attractive as building blocks in soft photonic crystals and advanced chiroptical devices.Herein,a chirality invertible hydrazone photoswit...Inspired by nature,dynamic self-organized helical superstructures are becoming attractive as building blocks in soft photonic crystals and advanced chiroptical devices.Herein,a chirality invertible hydrazone photoswitch,possessing high helical twisting power(HTP)was judiciously designed and synthesized.Due to the photoinduced configuration changes of the hydrazone photoswitch,it displayed superior thermal stability and strikingly reversible HTP changes.By incorporating a novel chiral hydrazone(CH)into the liquid crystal(LC)host,a handedness invertible cholesteric liquid crystal(CLC)helical superstructure with high thermal stability and light-modulated photonic bandgap was prepared.We inferred that the mechanism of chirality inversion of the novel CH photoswitch derived from changes in the dihedral angle between the two naphthalene rings induced by hydrazone isomerization.Therefore,the influence of chemical structures on its photoresponsiveness was explored.Finally,the potential applications of this advanced light-driven CLC in soft photonic crystals,showing erasable and rewritable colorful patterns and chiroptical templates to induce handedness invertible circularly polarized luminescence were illustrated.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.52202081)Natural Science Foundation of Jiangxi Province(Grant No.20232BAB204030).
文摘The design and fabrication of advanced soft actuators with programmable actuation are highly desirable in constructing intelligent soft robots.In this work,a programmable light-driven liquid crystalline network(LCN)-based soft actuator was judiciously designed and prepared by constructing structural anisotropy across the thickness of the film.A three-dimensional(3D)deformable LCN actuator was realized by polymerization-induced phase separation of small-molarweight monomers and polymer networks.The resultant anisotropic LCN displays anisotropic microscale nanoporous architecture across the thickness in addition to uniform alignment at the molecular scale.The actuation behaviors of LCN film are tunable by adjusting the size and distribution of nanopores in LCN bulk via changing polymerization conditions and monomer components.More importantly,the nanoporous LCN film can be harnessed as a promising template to achieve diverse light responsiveness by changing the photothermal dyes via a feasible washing and refilling process,demonstrating a reprogrammable light-driven soft actuator.
基金supported by the National Natural Science Foundation of China(51927806,51921002,51903004 and 52202081)the National Natural Science Foundation of China Joint Fund(U22A20163)China Postdoctoral Science Foundation Funded Project(BX2021003 and 2022M720206)。
基金supported by the National Natural Science Foundation of China(52202081,52203322 and 52073028)the Natural Science Foundation of Jiangxi Province(20232BAB204030)China Postdoctoral Science Foundation funded project(BX2021003 and 2022M720206).
基金supported by the National Natural Science Foundation of China(grant nos.52202081,52073028,52073081,and 51720105002)the Natural Science Foundation of Jiangxi Province,China(grant no.20232BAB204030).
文摘Inspired by nature,dynamic self-organized helical superstructures are becoming attractive as building blocks in soft photonic crystals and advanced chiroptical devices.Herein,a chirality invertible hydrazone photoswitch,possessing high helical twisting power(HTP)was judiciously designed and synthesized.Due to the photoinduced configuration changes of the hydrazone photoswitch,it displayed superior thermal stability and strikingly reversible HTP changes.By incorporating a novel chiral hydrazone(CH)into the liquid crystal(LC)host,a handedness invertible cholesteric liquid crystal(CLC)helical superstructure with high thermal stability and light-modulated photonic bandgap was prepared.We inferred that the mechanism of chirality inversion of the novel CH photoswitch derived from changes in the dihedral angle between the two naphthalene rings induced by hydrazone isomerization.Therefore,the influence of chemical structures on its photoresponsiveness was explored.Finally,the potential applications of this advanced light-driven CLC in soft photonic crystals,showing erasable and rewritable colorful patterns and chiroptical templates to induce handedness invertible circularly polarized luminescence were illustrated.
