Research of Regularities of Aerosol Synthesis of Iron Oxide Particles

2019 ◽  
Vol 822 ◽  
pp. 327-333
Author(s):  
E.N. Chapalda ◽  
Sergey E. Aleksandrov ◽  
Ewelina Kucal
Keyword(s):  
Aqueous Solution ◽  
Iron Oxide ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Initial Solution ◽  
Iron Oxide Particles ◽  
Crystalline Inclusions ◽  
Ultrasonic Spray ◽  
Oxide Particles ◽  
Average Size

The influence of the concentration of the initial solution on the size and composition of the particles obtained by the method of ultrasonic spray pyrolysis (USP) was investigated. An aqueous solution of Fe (NО3)3·9Н2О, the concentration of which varied in the range of 0,0025–0,03 mol/l, was used as the starting material. As a result of the process, iron oxide particles were obtained, the average size of which varied from 123 to 292 nm. Based on FTIR and XRD, powders consist of several phases and have crystalline inclusions α-Fe2O3, β-Fe2O3, and γ-Fe2O3.

Influence of additives on the properties of spherical nickel particles prepared by ultrasonic spray pyrolysis

1999 ◽  
Vol 14 (7) ◽  
pp. 3059-3065 ◽  
Author(s):  
S. Stopić ◽  
J. Nedeljković ◽  
Z. Rakočević ◽  
D. Uskoković
Keyword(s):  
Aqueous Solution ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Scanning Tunneling ◽  
Thermal Gravimetric ◽  
Tunneling Microscopy ◽  
Ultrasonic Spray ◽  
Nickel Particles ◽  
Initial Reduction ◽  
Mean Diameter

Ideal spherical nonagglomerated Ni particles (mean diameter 0.62–1.12 μm) were prepared by ultrasonic spray pyrolysis of NiCl2 aqueous solution in the presence of 0.1 mass% of Pd, Cu, or Ni in an H2–N2 atmosphere at 900 °C. Incomplete reduction of the NiCl2 aqueous solution in the absence of additives was observed under the same conditions. Differential thermal and thermal-gravimetric analyses revealed a decrease in initial reduction temperature of NiCl2 from 375 to 275 °C by the addition of Pd, Cu, or Ni. The morphology of Ni particles was analyzed using scanning tunneling microscopy. The surface roughness of Ni particles was found to be controllable by addition of appropriate additives.

Sintering and Dielectric Properties of Ba(Mg1/3Ta2/3)O3 Particle Prepared by Spray Pyrolysis

2008 ◽  
Vol 388 ◽  
pp. 245-248 ◽  
Author(s):  
Hiroki Yamada ◽  
Takashi Okawa ◽  
Takashi Ogihara
Keyword(s):  
Electron Microscopy ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Nano Particles ◽  
Ultrasonic Spray ◽  
Transmission Electron ◽  
Powder Particles ◽  
Average Size ◽  
Micrometer Size ◽  
20 Nm

Ba(Mg1/3Ta2/3)O3 (BMT) powders were successfully prepared by ultrasonic spray pyrolysis from an aqueous solution of Ba, Mg and Ta. The particles characteristics of BMT nano-sized powders were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). As-prepared powder particles had a sub-micrometer size with a narrow distribution. Transmission electron microscopy (TEM) observation revealed that the average size of the BMT nano-particles was around 20 nm, and that these particles were aggregated. The dielectric constant (r) of 23.2 and the Q・f of 98,300 were obtained at 1550°C by a spray pyrolysis.

The roles of ammonia and ammonium bicarbonate in the preparation of nickel particles from nickel chloride

2000 ◽  
Vol 15 (10) ◽  
pp. 2157-2166 ◽  
Author(s):  
B. Xia ◽  
I. W. Lenggoro ◽  
K. Okuyama
Keyword(s):  
Aqueous Solution ◽  
Spray Pyrolysis ◽  
Reaction Pathway ◽  
Ultrasonic Spray Pyrolysis ◽  
Precursor Solution ◽  
Nickel Chloride ◽  
Ammonium Bicarbonate ◽  
Solution Chemistry ◽  
Ultrasonic Spray ◽  
Nickel Particles

The roles of NH3 · H2O and NH4HCO3 in the preparation of Ni particles from NiCl2 · 6H2O aqueous solution by ultrasonic spray pyrolysis were investigated. The results showed that both ammonia and ammonium bicarbonate had a remarkable influence on the solution chemistry and the resulting particles, and could significantly modify the reaction pathway. After the addition of these additives to the precursor solution, intermediate NiO was formed initially, followed by reduction to metallic Ni in the presence of a reductive gas. H2 is a powerful reducing agent; however, metallic Ni could also be obtained in the absence of H2 in the carrier gas. In the latter case, it was shown that NH3 was primarily responsible for Ni formation. A description of the mechanisms and processes of Ni formation during spray pyrolysis is proposed.

Characterization of CuInS2 Thin Films Grown by Transducer-based Ultrasonic Spray Pyrolysis for PV Solar Cells Applications

2016 ◽  
Vol 19 (3) ◽  
pp. 169-179 ◽  
Author(s):  
Eric Nguwuo Petuenju ◽  
Oumarou Savadogo
Keyword(s):  
Thin Films ◽  
Aqueous Solution ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Spray Pyrolysis Method ◽  
Ultrasonic Spray ◽  
Pyrolysis Method ◽  
Cuins2 Thin Films ◽  
First Time

For the first time, the elaboration of CuInS2 thin films was achieved using the transducer-based ultrasonic spray pyrolysis method with methanol as solvent. Precursor solutions were prepared with copper dichloride dihydrate [CuCl2.2H2O], indium (III) chloride tetrahydrate [InCl3.4H2O] and thiourea [SC(NH2)2] at different ratios. In2S3 clusters (μdots) were obtained from an aqueous solution with precursors ratio Cu:In:S = 1.3:1:3.9, 1.4:1:3.9, 1.5:1:3.9. CuInS2 thin films were obtained from a solution of methanol with precursors ratio Cu:In:S = 1:1:4. The In concentration was 3 x 10-3 mol/l. The crystalline structure and their morphology ware characterised by SEM and their chemical composition by EDAX, The bandgap of CuInS2, equals to 1.40 eV, was determined by spectrophotometry.

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