Multi-walled carbon nanotubes （MWCNTs） were irradiated with focused electron beams in a transmission electron microscope at room temperature. The results showed that carbon nanotubes had no obvious structural damage...Multi-walled carbon nanotubes （MWCNTs） were irradiated with focused electron beams in a transmission electron microscope at room temperature. The results showed that carbon nanotubes had no obvious structural damages but only shell bending under 100 keV electron beam irradiation. However, when the electron energy increased to 200 keV, the nanotubes were damaged and amorphization, pits and gaps were detected. Furthermore, generating of carbon onions and welding between two MWCNTs occurred under 200 keV electron irradiation. It was easy to destroy the MWCNTs as the electron beams exceeded the displacement threshold energy that was calculated to be 83-110 keV. Conversely, the energy of electron beams below the threshold energy was not able to damage the tubes. The damage mechanism is sputtering and atom displacement.展开更多
Clenbuterol and some kinds of antibiotic are banned strictly using as veterinary drug by Europe Union,America and Chinese Agriculture Ministry.Electronic irradiation can change difficultly degraded pollutants into eas...Clenbuterol and some kinds of antibiotic are banned strictly using as veterinary drug by Europe Union,America and Chinese Agriculture Ministry.Electronic irradiation can change difficultly degraded pollutants into easily degraded pollutants.Clenbuterol,SC and AOZ can be degraded more than 95% when the irradiation dosage was greater than 6kGy.These results indicated such irradiation method is applicable.展开更多
基金Project(91026018)supported by the National Natural Science Foundation of ChinaProject(20110111110015)supported by the Doctoral Fund of Ministry of Education of China
文摘Multi-walled carbon nanotubes （MWCNTs） were irradiated with focused electron beams in a transmission electron microscope at room temperature. The results showed that carbon nanotubes had no obvious structural damages but only shell bending under 100 keV electron beam irradiation. However, when the electron energy increased to 200 keV, the nanotubes were damaged and amorphization, pits and gaps were detected. Furthermore, generating of carbon onions and welding between two MWCNTs occurred under 200 keV electron irradiation. It was easy to destroy the MWCNTs as the electron beams exceeded the displacement threshold energy that was calculated to be 83-110 keV. Conversely, the energy of electron beams below the threshold energy was not able to damage the tubes. The damage mechanism is sputtering and atom displacement.
文摘Clenbuterol and some kinds of antibiotic are banned strictly using as veterinary drug by Europe Union,America and Chinese Agriculture Ministry.Electronic irradiation can change difficultly degraded pollutants into easily degraded pollutants.Clenbuterol,SC and AOZ can be degraded more than 95% when the irradiation dosage was greater than 6kGy.These results indicated such irradiation method is applicable.
