Atomically dispersed metal catalysts have high metal atom utilization and catalytic activity.However,the rational design and large-scale preparation of such catalysts,particularly with high metal content,remains a big...Atomically dispersed metal catalysts have high metal atom utilization and catalytic activity.However,the rational design and large-scale preparation of such catalysts,particularly with high metal content,remains a big challenge due to the generally used high-temperature pyrolysis.Herein,we illustrate a two-step solution:at first,an iron precursor complex was spatially confined in a porous metal-organic framework,Co(BTB);In the second,the precursor complex was immobilized on the surface under 300℃.Owing to the high surface area and large-sized channels of Co(BTB),comprehensive characterization revealed that the immobilized iron sites were atomically dispersed on the surface even with very high metal content.The catalyst exhibited tunable and extraordinary catalytic performance in oxygen evolution reactions(OERs).With an Fe content of 4.1 wt%,an overpotential of 261 mV and unprecedented Tafel slope of 27 mV dec^(−1)were observed,which could be attributed to the fully exposed iron sites on the surface.This fabrication method was performed at a relatively low temperature with quantitative yield,providing a facile approach for the rational design of a high-performance,stable,yet atomically dispersed metal-nitrogen-carbon electrocatalyst with tunable metal content.展开更多
The aim of this study was to investigate the inhibitory effect of heparin/fibronectin （Hep/Fn） complexes on neointimal hyperplasia following endovascular intervention. Hep/Fn complexes were immobilized onto titanium...The aim of this study was to investigate the inhibitory effect of heparin/fibronectin （Hep/Fn） complexes on neointimal hyperplasia following endovascular intervention. Hep/Fn complexes were immobilized onto titanium （Ti） surfaces, with subsequent X-ray photoelectron spectroscopy （XPS）, Toluidine Blue 0 （TBO） and immunohistochemistry methods were used to characterize surface properties. Smooth muscle cell （SMC） cultures were used to evaluate the effect of Hep/Fn complexes on SMC proliferation. Results showed that Hep/Fn complexes successfully immobilized onto Ti surfaces and resulted in an inhibition of SMC proliferation. This study suggests that Hep/Fn surface-immobilized biomaterials develop as a new generation of biomaterials to prevent neointimal hyperplasia, particularly for use in cardiovascular implants.展开更多
Desalination is considered a viable method to overcome the issue of water scarcity either from waste water or seawater. For this purpose, this study employed a facile approach to develop surface immobilized oxidized-M...Desalination is considered a viable method to overcome the issue of water scarcity either from waste water or seawater. For this purpose, this study employed a facile approach to develop surface immobilized oxidized-MWCNTs(o-MWCNTs) onto crosslinked polyvinyl alcohol(PVA) membrane. Firstly, modified polysulphone substrate was synthesized on to which crosslinked PVA layer was spread onto it. PVA layer act as active layer for surface immobilization of o-MWCNTs in varying concentration. The functional group analysis, morphology and roughness of membranes surface was conducted out using FTIR, SEM and AFM respectively. The results showed that modified membranes, immobilized o-MWCNTs enhanced the salt rejection(Na_(2)SO_(4)) upto 99.8%. After contacting with Escherichia coli and Staphylococcus aureus for 2.5 h the bacteria mortalities of the fabricated membrane could reach 96.9%. Furthermore, the antibiofouling tests showed that OP-MWCNTs(1-5) modified membranes have higher anti-biofouling property than the control membrane.展开更多
基金the financial support from Central South UniversityState Grid Shaanxi Electric Power Research InstituteNatural Science Foundation of Hunan Province(2022JJ3068)。
文摘Atomically dispersed metal catalysts have high metal atom utilization and catalytic activity.However,the rational design and large-scale preparation of such catalysts,particularly with high metal content,remains a big challenge due to the generally used high-temperature pyrolysis.Herein,we illustrate a two-step solution:at first,an iron precursor complex was spatially confined in a porous metal-organic framework,Co(BTB);In the second,the precursor complex was immobilized on the surface under 300℃.Owing to the high surface area and large-sized channels of Co(BTB),comprehensive characterization revealed that the immobilized iron sites were atomically dispersed on the surface even with very high metal content.The catalyst exhibited tunable and extraordinary catalytic performance in oxygen evolution reactions(OERs).With an Fe content of 4.1 wt%,an overpotential of 261 mV and unprecedented Tafel slope of 27 mV dec^(−1)were observed,which could be attributed to the fully exposed iron sites on the surface.This fabrication method was performed at a relatively low temperature with quantitative yield,providing a facile approach for the rational design of a high-performance,stable,yet atomically dispersed metal-nitrogen-carbon electrocatalyst with tunable metal content.
基金supported by the financial support of Natural Science Research Program of Jiangsu Education Department(No.13KJB310014)Natural Science Foundation of Jiangsu Province(BK20140429)the Natural Science Foundation of Nantong University(No.14ZY015,No.13R23)
文摘The aim of this study was to investigate the inhibitory effect of heparin/fibronectin （Hep/Fn） complexes on neointimal hyperplasia following endovascular intervention. Hep/Fn complexes were immobilized onto titanium （Ti） surfaces, with subsequent X-ray photoelectron spectroscopy （XPS）, Toluidine Blue 0 （TBO） and immunohistochemistry methods were used to characterize surface properties. Smooth muscle cell （SMC） cultures were used to evaluate the effect of Hep/Fn complexes on SMC proliferation. Results showed that Hep/Fn complexes successfully immobilized onto Ti surfaces and resulted in an inhibition of SMC proliferation. This study suggests that Hep/Fn surface-immobilized biomaterials develop as a new generation of biomaterials to prevent neointimal hyperplasia, particularly for use in cardiovascular implants.
文摘Desalination is considered a viable method to overcome the issue of water scarcity either from waste water or seawater. For this purpose, this study employed a facile approach to develop surface immobilized oxidized-MWCNTs(o-MWCNTs) onto crosslinked polyvinyl alcohol(PVA) membrane. Firstly, modified polysulphone substrate was synthesized on to which crosslinked PVA layer was spread onto it. PVA layer act as active layer for surface immobilization of o-MWCNTs in varying concentration. The functional group analysis, morphology and roughness of membranes surface was conducted out using FTIR, SEM and AFM respectively. The results showed that modified membranes, immobilized o-MWCNTs enhanced the salt rejection(Na_(2)SO_(4)) upto 99.8%. After contacting with Escherichia coli and Staphylococcus aureus for 2.5 h the bacteria mortalities of the fabricated membrane could reach 96.9%. Furthermore, the antibiofouling tests showed that OP-MWCNTs(1-5) modified membranes have higher anti-biofouling property than the control membrane.
