Fabrication of Nano-Sized Powders from Waste Solution by Spray Pyrolysis Process

Yu, Jae-Keun; Kim, Gyeonghwan; Kim, Taek‐Soo; Kim, Jwayeon

doi:10.2320/matertrans.46.1695

Cited by 18 publications

(8 citation statements)

References 7 publications

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“…This result is owing to the following facts: because of the high reaction temperature, there is a severe droplet burst during the pyrolysis reaction; the ratio of the droplets, in which tin oxide single crystals aggregate, decreases sharply; most of the single crystals are in the shape of an independent entity; and the average particle size of single crystals decreases. Figure 7 is the 30,000 times magnified image under SEM, which shows the property change of the generated powder relative to the concentration of raw material solution rising from 75 g/L to 400 g/L, given that the reaction temperature is kept at 900°C, the inflow speed of the raw material solution at 20 ml/min, the nozzle tip size at 2 mm, and the air pressure at 3 kg/cm 2 . Figure 8 is the 200,000 times magnified image under SEM, which shows the property change of the powder under the same reaction conditions as of Fig.…”

Section: Jcs-japanmentioning

confidence: 99%

Influences of reaction factors on the nano-sized tin oxide powder by spray pyrolysis process

Kim

2009

J. Ceram. Soc. Japan

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In this study, by using tin chloride solution as the raw material, a nano-sized tin oxide powder with an average particle size below 50 nm is generated by spray pyrolysis reaction. This study also examines the influences of the reaction temperature and the concentration of raw material solution on the powder properties. As the reaction temperature increases from 800 to 850°C, the average particle size of the generated powder increases from 20 nm to 30 nm, the intensity of XRD peak increases, and the specific surface area decreases. As the reaction temperature reaches 900°C, produced powder of droplet type are composed of nano-sized particles with an average size of 30 nm, while the average particle size of the independent type increases remarkably up to 80-100 nm, and the particle surface becomes more compact. As the reaction temperature reaches 950°C, most of the particles appear mutually independent, while the average particle size is around 70 nm. When the tin concentration reaches 75 g/L, the average particle size of the generated powder is below 20 nm. When the tin concentration reaches 150 g/L, the powder of droplet type are composed of nano particles with an average size around 30 nm, whereas the average size of the independent particles increases up to 80-100 nm. Also, the intensity of XRD peak increases, and the specific surface area decreases. When the concentration reaches 400 g/L, the droplet types are composed of nano-particles with an average size of 30 nm. Also, the intensity of XRD peak increases, and the specific surface area decreases.

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Section: Jcs-japanmentioning

confidence: 99%

Influences of reaction factors on the nano-sized tin oxide powder by spray pyrolysis process

Kim

2009

J. Ceram. Soc. Japan

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“…Spray pyrolysis process [1][2][3][4][5][6][7][8][9][10][11] was one of the methods of manufacturing nano-sized metal oxide powder. In this reaction, chemical components are uniformly blended in the solution state so as to make a complex solution, which was in turn sprayed into a reaction furnace with a high temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nozzle Tip Size on the Fabrication of Nano-Sized Nickel Oxide Powder by Spray Pyrolysis Process

Kim¹,

Yu²

2013

Korean. J. Mater. Res.

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In this study, by using nickel chloride solution as a raw material, a nano-sized nickel oxide powder with an average particle size below 50 nm was produced by spray pyrolysis reaction. A spray pyrolysis system was specially designed and built for this study. The influence of nozzle tip size on the properties of the produced powder was examined. When the nozzle tip size was 1 mm, the particle size distribution was more uniform than when other nozzle tip sizes were used and the average particle size of the powder was about 15 nm. When the nozzle tip size increases to 2 mm, the average particle size increases to roughly 20 nm, and the particle size distribution becomes more uneven. When the tip size increases to 3 mm, particles with an average size of 25 nm and equal to or less than 10 nm coexist and the particle size distribution becomes much more uneven. When the tip size increases to 5 mm, large particles with average size of 50 nm partially exist, mostly consisting of minute particles with average sizes in the range of 15~25 nm. When the tip size increases from 1 mm to 2 mm, the XRD peak intensities greatly increase while the specific surface area decreases. When the tip size increases to 3 mm, the XRD peak intensities decrease while the specific surface area increases. When the tip size increases to 5 mm, the XRD peak intensities increase again while the specific surface area decreases.

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“…Spray pyrolysis method [1][2][3][4][5][6] is well known to be very effective in manufacturing high-quality functional powder. The engineering advantages of this method include the following: 1) the manufacture processes, such as the mixing, calcination, and milling of solid powder, can be omitted; 2) the properties of the particles can be controlled by adjusting the conditions of the pyrolysis reaction.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Nano-Sized Tin Oxide Powder from Tin Chloride Solution by Spray Pyrolysis Process

Yu¹,

Kim²

2011

Korean. J. Mater. Res.

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In this study, by using tin chloride solution as a raw material, a nano-sized tin oxide powder with an average particle size below 50 nm is generated by a spray pyrolysis process. The properties of the generated tin oxide powder depending on the inflow speed of the raw material solution are examined. When the inflow speed of the raw material solution is 2 ml/min, the majority of generated particles appear in the shape of independent polygons with average size above 80-100 nm, while droplet-shaped particles show an average size of approximately 30 nm. When the inflow speed is increased to 5 ml/min, the ratio of independent particles decreases, and the average particle size is approximately 80-100 nm. When the inflow speed is increased to 20 ml/min, the ratio of droplet-shaped particles increases, whereas the ratio of independent particles with average size of 80-100 nm decreases. When the inflow speed is increased to 100 ml/min, the average size of the generated particles is around 30-40 nm, and most of them maintain a droplet shape. With a rise of inflow speed from 2 ml/min to 5 ml/min, a slight increase of the XRD peak intensity and a minor decrease of specific surface area are observed. When the inflow speed is increased to 20 ml/min, the XRD peak intensity falls dramatically, although a significant rise of specific surface area is observed. When the inflow speed is increased to 100 ml/min, the XRD peak intensity further decreases, while the specific surface area increases.Key words tin chloride solution, spray pyrolysis process, nano-sized tin oxide powder, average particle size, inflow speed of raw material solution.

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Fabrication of Nano-Sized Powders from Waste Solution by Spray Pyrolysis Process

Cited by 18 publications

References 7 publications

Influences of reaction factors on the nano-sized tin oxide powder by spray pyrolysis process

Influences of reaction factors on the nano-sized tin oxide powder by spray pyrolysis process

Effect of Nozzle Tip Size on the Fabrication of Nano-Sized Nickel Oxide Powder by Spray Pyrolysis Process

Preparation of Nano-Sized Tin Oxide Powder from Tin Chloride Solution by Spray Pyrolysis Process

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