Due to the lack of in-depth understanding about the folding issues of the electronic materials,it is a huge challenge to pre-pare a super-foldable and highly electrochemical faradic electrode.Here,inspired from from t...Due to the lack of in-depth understanding about the folding issues of the electronic materials,it is a huge challenge to pre-pare a super-foldable and highly electrochemical faradic electrode.Here,inspired from from the fully nimble structures of cuit cocoons and cockscomb petals,with two-level biomimetic design,for the first time we prepared a super-foldable and electrochemically functional freestanding cathode,made of C-fiber@NiS-cockscomb(SFCNi).In virtue of its nimble biomi-metic structures,SFCNi can remarkably sustain over 100,000 times,repeated true-folding without composite fibers fracture,functional matters detachment,conductivity degradation,or electrochemical performance change.The main mechanism behind these behaviors was disclosed by Real-time scanning electron microscopy and mechanical simulations,on the folding process.Results unveil that the cockscomb-like NiS with atomic thickness can deform freely due to the need of bending,and the cuit-cocoon-like SFCNi can generate an“ε-shape”folding structure at the crease.Such a smart self-adaptive deforma-tion capability can effectively reduce the effect of stresses and local excessive deformations,so that the chemical bonds can preserve their interaction,and the material won’t fracture.This subtle and exceptional mechanical behavior realizes a super-foldable property.The two-level biomimetic design strategy is a novel method for fabrication of super-foldable composite electrodes and integrated multi-functional super-foldable devices.展开更多
Melamine (Mel),a contaminant that has received much attention in recent years,has been adulterated into milk powder,causing a large number of infants suffering from kidney stone disease.To study the process and mechan...Melamine (Mel),a contaminant that has received much attention in recent years,has been adulterated into milk powder,causing a large number of infants suffering from kidney stone disease.To study the process and mechanism of calcium phosphate (CAP)stone formation induced by Mel,we simulated the formation process of CaP stones and studied the effect of Mel on crystallization in aqueous and synthetic urine systems,respectively.Ion selective electrode method was used to study the thermodynamic parameters and reaction rate of the crystallization process.It was firstly discovered that Mel could induce the formation of CaP crystals significantly under weak acidic urine conditions in which CaP cannot be stably present,so it may cause people to produce CaP stones.Thermodynamic parameter and reaction rate analysis indicated that Mel could increase the reaction tendency and accelerate the formation of CaP crystals,which was achieved by two process of electrostatic adsorption and release of calcium ions.This research is expected to provide scientific guidance for the prevention and treatment of Mel-related stones.展开更多
基金We appreciate the financial support of the National Natural Science Foundation of China(No.22176145,51771138)the Fundamental Research Funds for the Central Universities(22120210137)the State Key Laboratory of Fine Chemicals,Dalian University of Technology(KF 2001).
文摘Due to the lack of in-depth understanding about the folding issues of the electronic materials,it is a huge challenge to pre-pare a super-foldable and highly electrochemical faradic electrode.Here,inspired from from the fully nimble structures of cuit cocoons and cockscomb petals,with two-level biomimetic design,for the first time we prepared a super-foldable and electrochemically functional freestanding cathode,made of C-fiber@NiS-cockscomb(SFCNi).In virtue of its nimble biomi-metic structures,SFCNi can remarkably sustain over 100,000 times,repeated true-folding without composite fibers fracture,functional matters detachment,conductivity degradation,or electrochemical performance change.The main mechanism behind these behaviors was disclosed by Real-time scanning electron microscopy and mechanical simulations,on the folding process.Results unveil that the cockscomb-like NiS with atomic thickness can deform freely due to the need of bending,and the cuit-cocoon-like SFCNi can generate an“ε-shape”folding structure at the crease.Such a smart self-adaptive deforma-tion capability can effectively reduce the effect of stresses and local excessive deformations,so that the chemical bonds can preserve their interaction,and the material won’t fracture.This subtle and exceptional mechanical behavior realizes a super-foldable property.The two-level biomimetic design strategy is a novel method for fabrication of super-foldable composite electrodes and integrated multi-functional super-foldable devices.
基金This work was supported by the National Natural Science Foundation of China (Nos. 51771138, 91122025)the State Major Research Plan (973) of China (No. 2011CB932404).
文摘Melamine (Mel),a contaminant that has received much attention in recent years,has been adulterated into milk powder,causing a large number of infants suffering from kidney stone disease.To study the process and mechanism of calcium phosphate (CAP)stone formation induced by Mel,we simulated the formation process of CaP stones and studied the effect of Mel on crystallization in aqueous and synthetic urine systems,respectively.Ion selective electrode method was used to study the thermodynamic parameters and reaction rate of the crystallization process.It was firstly discovered that Mel could induce the formation of CaP crystals significantly under weak acidic urine conditions in which CaP cannot be stably present,so it may cause people to produce CaP stones.Thermodynamic parameter and reaction rate analysis indicated that Mel could increase the reaction tendency and accelerate the formation of CaP crystals,which was achieved by two process of electrostatic adsorption and release of calcium ions.This research is expected to provide scientific guidance for the prevention and treatment of Mel-related stones.
