Effect of Ambient Air Pressure on the Preparation of Cobalt Oxide Powder with Average Particle Size below 50 nm by Spray Pyrolysis Process
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초록
When the ambient air pressure was 0.1 kg/cm , there were few spherically formed droplets, which showed very badly fragmented state. The average particle size of the particles constituting the droplet was about 40 nm. When the air pressure increased to 0.5 kg/cm 2 , the ratio of the spherical droplet forms increased, but still showed a state of severe disruption. The average particle size of the particles was reduced to about 35 nm. As the air pressure increased to 3 kg/cm 2 , the ratio of spherical droplet form significantly increased, the degree of fragmentation even further decreased and the average particle size decreased to 30 nm. When the air pressure increased from 0.1 to 1 kg/cm 2 , the XRD peak intensity showed little change, but the specific surface area was decreased. As the air pressure increased to 3 kg/cm 2 , the intensity of XRD peaks showed a little decrease, while the specific surface area increased.
Abstract
When the ambient air pressure was 0.1 kg/cm , there were few spherically formed droplets, which showed very badly fragmented state. The average particle size of the particles constituting the droplet was about 40 nm. When the air pressure increased to 0.5 kg/cm 2 , the ratio of the spherical droplet forms increased, but still showed a state of severe disruption. The average particle size of the particles was reduced to about 35 nm. As the air pressure increased to 3 kg/cm 2 , the ratio of spherical droplet form significantly increased, the degree of fragmentation even further decreased and the average particle size decreased to 30 nm. When the air pressure increased from 0.1 to 1 kg/cm 2 , the XRD peak intensity showed little change, but the specific surface area was decreased. As the air pressure increased to 3 kg/cm 2 , the intensity of XRD peaks showed a little decrease, while the specific surface area increased.
참고문헌 (10)
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