Dynamical transition of soft porous organic nanocage:The fingerprint of water-regulated ion conduction and viscoelasticityOA
To understand the importance of water in biomacromolecules and supramolecular materials,the monodispersed 1 nm porous organic nanocage(POC)is studied for their hierarchical condensed structures and relaxation dynamics at different hydration levels.The POCs possess flexible framework and their bulks stay intrinsically in glassy state with well-defined transition temperatures(Tg)and they can be attenuated from 61 to−50℃with glass-to-rubber transition upon the increasing of hydration levels.Two-level relaxation dynamics can be probed and the temperature dependence of their relaxation time differentiates them as cooperative backbone dynamics(α)and local groups dynamics(β).The dynamical transition ofαrelaxation is consistent with Tg in hydration dependence.Suggested from MD simulation,water binds to the surface amine groups of POCs and accelerate its local dynamics,leading to the activated backbone dynamics for the broadly tunable visco-elasticity and thermal hysteresis for anti-freeze property.In small-angle X-ray scattering studies,the physical denaturation of POC can be observed as collapsed molecular framework and altered solubility when heated above their Tg in salt solutions.The microscopic understanding inspires the applications of hydrated POCs for elastomers and aqueous lithium electrolyte with high ionic conductivity,chemical stability and mechanical flexibility.
Linkun Cai;Weigang Sun;Wenqiang You;Jiadong Chen;Xueying Yuan;Xiupeng Chen;Xian Kong;Yuyan Lai;Panchao Yin
State Key Laboratory of Luminescent Materials and Devices&South China Advanced Institute for Soft Matter Science and Technology,Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials,South China University of Technology,Guangzhou 510641,ChinaState Key Laboratory of Luminescent Materials and Devices&South China Advanced Institute for Soft Matter Science and Technology,Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials,South China University of Technology,Guangzhou 510641,ChinaState Key Laboratory of Luminescent Materials and Devices&South China Advanced Institute for Soft Matter Science and Technology,Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials,South China University of Technology,Guangzhou 510641,ChinaState Key Laboratory of Luminescent Materials and Devices&South China Advanced Institute for Soft Matter Science and Technology,Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials,South China University of Technology,Guangzhou 510641,ChinaState Key Laboratory of Luminescent Materials and Devices&South China Advanced Institute for Soft Matter Science and Technology,Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials,South China University of Technology,Guangzhou 510641,ChinaState Key Laboratory of Luminescent Materials and Devices&South China Advanced Institute for Soft Matter Science and Technology,Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials,South China University of Technology,Guangzhou 510641,ChinaState Key Laboratory of Luminescent Materials and Devices&South China Advanced Institute for Soft Matter Science and Technology,Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials,South China University of Technology,Guangzhou 510641,ChinaState Key Laboratory of Luminescent Materials and Devices&South China Advanced Institute for Soft Matter Science and Technology,Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials,South China University of Technology,Guangzhou 510641,ChinaState Key Laboratory of Luminescent Materials and Devices&South China Advanced Institute for Soft Matter Science and Technology,Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials,South China University of Technology,Guangzhou 510641,China
通用工业技术
porous organic cage(POC)relaxation dynamicsnanoconfinementsupramolecular materialsglassy state
《Nano Research》 2026 (4)
P.1055-1061,7
supported by the National Natural Science Foundation of China(Nos.22241501 and 92261117)the Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology,the Open Fund of the China Spallation Neutron Source Songshan Lake Science City(No.KFKT2023A09)TCL science and technology innovation fund(No.20222056)Guangzhou Municipal Science and Technology Bureau(No.2023A04J1364).
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