The functional materials based on natural zeolite(clinoptilolite),TiO2-zeolite and Ag-TiO2-zeolite have been successfully synthesized by solid-state reaction in fast-hydrothermal conditions.The obtained functional mat...The functional materials based on natural zeolite(clinoptilolite),TiO2-zeolite and Ag-TiO2-zeolite have been successfully synthesized by solid-state reaction in fast-hydrothermal conditions.The obtained functional materials were investigated by X-ray diffraction(XRD),FT-IR(Fourier transform infrared)spectroscopy,DRUV-VIS(diffuse reflectance ultraviolet-visible)spectroscopy,BET(Brunauer-Emmett-Teller)and SEM/EDX(scanning electron microscope/energy dispersive X-ray spectrometer)analyses.The XRD results indicated that the clinoptilolite structure has a good thermal stabilization after the fast-hydrothermal treatment.Also,the high specific surface area about 92.55 m2·g 1was noticed for Ag-TiO2-zeolite functional material.The presence of dopants was evidenced from EDX spectra.The enhanced bactericidal activity of Ag-TiO2-zeolite catalyst is proved through damaging of Enterococcus faecalis colonies under visible irradiation,at different material doses and irradiation times.展开更多
Bionanosensors and nanosensors have been devised in recent years with the use of various materials including carbon-based nanomaterials, for applications in diagnostics, environmental science and microelectronics. Car...Bionanosensors and nanosensors have been devised in recent years with the use of various materials including carbon-based nanomaterials, for applications in diagnostics, environmental science and microelectronics. Carbon-based materials are critical for sensing applications, as they have physical and electronic properties which facilitate the detection of substances in solutions, gaseous compounds and pollutants through their conductive prop- erties and resonance-frequency transmission capacities. In this review, a series of recent studies of carbon nanotubes （CNTs） based nanosensors and optical systems are repor- ted, with emphasis on biochemical, chemical and envi- ronmental detection. This study also encompasses a background and description of the various properties of the nanomaterials, and the operation mechanism of the man- ufactured nanosensors. The use of computational chemistry is applied in describing the electronic properties and molecular events of the included nanomaterials during operation. This review shows that resonance-based sensing technologies reach detection limits for gases, such as ammonia down to 10-24 level. The study also shows that the properties of the carbon nanomaterials give them unique features that are critical for designing new sensors based on electrocatalysis and other reactive detection mechanisms. Several research fields can benefit from the described emerging technologies, such as areas of research in environmental monitoring, rapid-on site diagnostics, in situ analyses, and blood and urine sampling in medical and sport industry. Carbon nanomaterials are critical for the operational sensitivity of nanosensors. Considering the low cost of fabrication, carbon nanomaterials can represent an essential step in the manufacturing of tomorrow＇s commercial sensors.展开更多
基金Supported by the Sectoral Operational Programme Human Resources Development(SOP HRD)Financed from the European Social Fundthe Romanian Government under the Contract Number POSDRU/89/1.5/S/63700
文摘The functional materials based on natural zeolite(clinoptilolite),TiO2-zeolite and Ag-TiO2-zeolite have been successfully synthesized by solid-state reaction in fast-hydrothermal conditions.The obtained functional materials were investigated by X-ray diffraction(XRD),FT-IR(Fourier transform infrared)spectroscopy,DRUV-VIS(diffuse reflectance ultraviolet-visible)spectroscopy,BET(Brunauer-Emmett-Teller)and SEM/EDX(scanning electron microscope/energy dispersive X-ray spectrometer)analyses.The XRD results indicated that the clinoptilolite structure has a good thermal stabilization after the fast-hydrothermal treatment.Also,the high specific surface area about 92.55 m2·g 1was noticed for Ag-TiO2-zeolite functional material.The presence of dopants was evidenced from EDX spectra.The enhanced bactericidal activity of Ag-TiO2-zeolite catalyst is proved through damaging of Enterococcus faecalis colonies under visible irradiation,at different material doses and irradiation times.
文摘Bionanosensors and nanosensors have been devised in recent years with the use of various materials including carbon-based nanomaterials, for applications in diagnostics, environmental science and microelectronics. Carbon-based materials are critical for sensing applications, as they have physical and electronic properties which facilitate the detection of substances in solutions, gaseous compounds and pollutants through their conductive prop- erties and resonance-frequency transmission capacities. In this review, a series of recent studies of carbon nanotubes （CNTs） based nanosensors and optical systems are repor- ted, with emphasis on biochemical, chemical and envi- ronmental detection. This study also encompasses a background and description of the various properties of the nanomaterials, and the operation mechanism of the man- ufactured nanosensors. The use of computational chemistry is applied in describing the electronic properties and molecular events of the included nanomaterials during operation. This review shows that resonance-based sensing technologies reach detection limits for gases, such as ammonia down to 10-24 level. The study also shows that the properties of the carbon nanomaterials give them unique features that are critical for designing new sensors based on electrocatalysis and other reactive detection mechanisms. Several research fields can benefit from the described emerging technologies, such as areas of research in environmental monitoring, rapid-on site diagnostics, in situ analyses, and blood and urine sampling in medical and sport industry. Carbon nanomaterials are critical for the operational sensitivity of nanosensors. Considering the low cost of fabrication, carbon nanomaterials can represent an essential step in the manufacturing of tomorrow＇s commercial sensors.
