• Proceedings of the KAIS Fall Conference
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• 2001.05a
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• pp.47-48
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• 2001

본 연구의 목적은 폐 구리염화물 용액을 원료로 사용하여 분무열분해 공정에 의해 평균입도가 1㎛이하이며 입도분포가 균일하고 치밀한 조직을 나타내는 미립의 구리산화물 분말을 제조하는데 있다. 또한 본 연구에서는 분무열분해 공정에 의해 생성되는 분말의 특성에 영향을 미치는 반응 온도, 원료용액의 유입속도, 분위기 기체 및 공기의 유입속도, nezzle tip 크기 및 원료용액의 농도 등의 반응인자들의 영향을 검토하였다.

• Korean Chemical Engineering Research
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• v.44 no.3
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• pp.235-242
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• 2006

Spray pyrosysis is a process to prepare particles and films by evaporating and decomposing droplets of precursor solutions in the order of 1-10 micrometer in diameter. Key elements of the spray pyrolysis process include precursor, solvent, droplet generator, and reactor. Various combination of these 4 elements produces wide range of particles and films. In general. the current status of the spray pyrolysis technology is not quite promising for commercial success. However, this process will be feasible to produce multicomponent functional materials of controlled morphology. In this paper, current status of the spray pyrolysis technology is introduced with the emphasis of production of fluorescence particles.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.8 no.2
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• pp.370-376
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• 1998

The powder preparation of Zinc-Silicate phosphors compound was studied by hydrothermal reaction starting from the precursor which prepared by spray pyrolysis method. This process protect including of impuritied from crushing process and Mineralizing in hydrothermal reactions. Using spray pyrolysis precursor, ${\alpha}-Zn_2SiO_4$ powder was prepared by the hydrothermal reaction under $250^{\circ}C$.

• 기계와재료
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• v.20 no.4
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• pp.57-66
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• 2009

• Proceedings of the Materials Research Society of Korea Conference
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• 2007.11a
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• pp.80.1-80.1
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• 2007

• Korean Chemical Engineering Research
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• v.43 no.4
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• pp.517-524
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• 2005

Barium titanate ($BaTiO_3$) particles were prepared by spray pyrolysis from spray solution containing organic additives. The effects of the type and amount of organic precursors on the crystal structure and morphology of the $BaTiO_3$ particles were investigated. It was found that the morphology of $BaTiO_3$ particles before and after calcination depended on the type of organic additives such as citric acid, ethylene glycol and polyethylene glycol. Among these organic additives, citric acid was the most effective to prepare $BaTiO_3$ particles with nano-structured morphology consisting with uniform size nanometer particles after calcination. It was also found that the phase transformability of the metastable cubic phase to the tetragonal one during calcination could be improved by increasing the content of citric acid in the spray solution. As a result, $BaTiO_3$ particles prepared from spray solution containing high concentration of citric acid had good tetragonality, uniform and fine size, and high BET surface area after calcination. $BaTiO_3$ particles prepared by spray pyrolysis had nanometer size and uniform morphology after simple ball milling process.

• Resources Recycling
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• v.12 no.4
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• pp.20-29
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• 2003

In order to efficiently recycle the waste solution resulting from shadow mask processing, nano-sized Ni-ferrite powder was fab-ricated through spray pyrolysis process. The average particle size of the powder was below 100nm. In this study, the effects of the reaction temperature. the concentration of raw material solution and the injection speed of solution on the properties of powder were respectively investigated. As the reaction temperature increased from $800^{\circ}C$ to $1100^{\circ}C$, average particle size of the powder significantly Increased and power structure became more solid, whereat its specific surface area was greatly reduced. Formation rate and crystallization of($NiFe_2$$O_4$) phale increased along with the temperature rise. As the concentrations of iron and nickel components in wastere solution increased, particle size of the powder became larger, particle size distribution became more irregular, and specific surface area was reduced. Formation rate and crystallization of $NiFe_2$$O_4$ phase increased significantly along with the increase of the concentration of solution. As the inlet speed of solution increased, particle size of the powder became larger, particle size distribution became wider, specific surface area was reduced and powder structure became less solid. As the inlet speed of solution decreased, formation rate and crystallization of $NiFe_2$$O_4$ phase significantly increased.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.7 no.2
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• pp.324-333
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• 1997

Porous alumina specimens with 80~92% relative densities were prepared from ultrasonic spray pyrolyzed alumina Powders by sintering at $1600^{\circ}$~ $1700^{\circ}C$. The exaggerated grain growth appeared to high sintering temperature and long soaking time. The microstructural development during sintering was investigated using image analysis. In the study of grain growth kinetics for sintering for spray prolyzed alumina powder, the activation energy for normal grain growth was 386.77 kJ/mol.

• Journal of the Korean Applied Science and Technology
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• v.31 no.4
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• pp.694-702
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• 2014

The micron-sized ITO(indium tin oxide) particles were prepared by spray pyrolysis from aqueous precursor solutions for indium, and tin and organic additives solution. Organic additives solution with citric acid(CA) and ethylene glycol(EG) were added to aqueous precursor solution for Indium and Tin. The obtained ITO particles prepared by spray pyrolysis from the aqueous solution without organic additives solution had spherical and filled morphologies whereas the obtained ITO particles with organic additives solution had more hollow and porous morphologies with increasing mole of organic additives. The micron-sized ITO particle with organic additives was changed fully to nano-sized ITO particle whereas the micron-sized ITO particle without organic additives was not changed fully to nano-sized ITO particle after post-treatment at $700^{\circ}C$ for 2 hours and wet-ball milling for 24 hours. The size of primary ITO particle by Debye-Scherrer formula and surface resistance of ITO pellet were measured.

• Journal of the Korean Applied Science and Technology
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• v.35 no.4
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• pp.1057-1072
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• 2018

In this study, micro-sized $CeO_2$ particles were synthesized by spray pyrolysis, and EG(ethylene glycol) and CA(citric acid) as organic additives were added to obtain hollow and porous particle during spray pyrolysis, and characteristics of obtained ceria were investigated according to the amount of added organic additives. Spray pyrolysis, postheat and ball-milling were combined to give 6 paths. $CeO_2$ nano-sized particle was obtained by the path which has sequence of Spray Pyrolysis with 0.5 M of EG and CA${\rightarrow}$Post-heat${\rightarrow}$Ball-milling${\rightarrow}$Post-heat among 6 paths. The average particle size(24 nm with standard deviation of 3.8 nm) of $CeO_2$ nano-sized particle by TEM analysis is close to the primary particle size(20 nm) which was calculated by Debye-Scherrer equation. To investigate the morphological characteristics and structure of the synthesized nanoparticle powders, SEM(Scanning Electron Microscopy), XRD(X-Ray Diffractometer) and TEM(Transmission Electron Microscopy) were used.