We investigate the effects of etching gases on the synthesis of nano crystalline diamonds grown on silicon substrate at the substrate temperature of 550℃ and the reaction pressure of 4 kPa by hot filament chemical va...We investigate the effects of etching gases on the synthesis of nano crystalline diamonds grown on silicon substrate at the substrate temperature of 550℃ and the reaction pressure of 4 kPa by hot filament chemical vapor deposition method, in which CH4 and H2 act as a source and diluting gases, respectively. N2, H2, and NH3 were used as the etching gases, respectively. Results show that the optimum conditions can be obtained only for the case of H2 gas. The crystal morphology and crystallinity of the samples have been examined by scanning electron microscopy and X-ray diffraction, respectively.展开更多
Cellulose,as the most abundant natural biopolymers in the world,has attracted much attention in recent years,as concerns have been raised on environmental issues associated with the use of petroleum related products.N...Cellulose,as the most abundant natural biopolymers in the world,has attracted much attention in recent years,as concerns have been raised on environmental issues associated with the use of petroleum related products.Nano crystalline cellulose(NCC)is a special type of cellulose that is derived from renewable and sustainable resources such as cotton and wood.NCC has a large specific surface area with plentiful hydroxyl and anionic sulfate ester groups,which make NCC a perfect substrate for preparing composite absorbing and/catalytic materials for wastewater treatment.This paper reviews recent research on the applications of NCC in wastewater treatment.展开更多
文摘We investigate the effects of etching gases on the synthesis of nano crystalline diamonds grown on silicon substrate at the substrate temperature of 550℃ and the reaction pressure of 4 kPa by hot filament chemical vapor deposition method, in which CH4 and H2 act as a source and diluting gases, respectively. N2, H2, and NH3 were used as the etching gases, respectively. Results show that the optimum conditions can be obtained only for the case of H2 gas. The crystal morphology and crystallinity of the samples have been examined by scanning electron microscopy and X-ray diffraction, respectively.
文摘Cellulose,as the most abundant natural biopolymers in the world,has attracted much attention in recent years,as concerns have been raised on environmental issues associated with the use of petroleum related products.Nano crystalline cellulose(NCC)is a special type of cellulose that is derived from renewable and sustainable resources such as cotton and wood.NCC has a large specific surface area with plentiful hydroxyl and anionic sulfate ester groups,which make NCC a perfect substrate for preparing composite absorbing and/catalytic materials for wastewater treatment.This paper reviews recent research on the applications of NCC in wastewater treatment.
