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.

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.

Dried plum-like ZnO assemblies consisted of ZnO nanoparticles synthesized by ultrasonic spray pyrolysis

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040005 ◽  
Author(s):  
Congzhi Zhang ◽  
Tao Han ◽  
Wei Wang ◽  
Jin Zhang
Keyword(s):  
Electron Microscopy ◽  
Spray Pyrolysis ◽  
Field Emission ◽  
Zno Nanoparticles ◽  
Ultrasonic Spray Pyrolysis ◽  
Precursor Solution ◽  
Spray Pyrolysis Method ◽  
X Ray Diffraction ◽  
Ultrasonic Spray ◽  
Transmission Electron

Dried plum-like ZnO assemblies consisting ZnO nanoparticles were synthesized by an ultrasonic spray pyrolysis method (USP). ZnO assemblies were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS) and field-emission transmission electron microscopy (TEM). The results show the size of ZnO assemblies is in the range of 300–870 nm, and that of ZnO nanoparticles is from 33 nm to 39 nm. The microstructure and size of ZnO assemblies were successfully controlled by the concentration of the precursor solution.

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.

Preparation and Characterization of Spherical Fine Nickel Particles by Ultrasonic Spray Pyrolysis

2013 ◽  
Vol 582 ◽  
pp. 11-14 ◽  
Author(s):  
Takayuki Kodera ◽  
Takuya Oomura ◽  
Qiong Wu ◽  
Ryouma Minami ◽  
Takashi Ogihara
Keyword(s):  
Spray Pyrolysis ◽  
Fine Particles ◽  
Average Particle Size ◽  
Ultrasonic Spray Pyrolysis ◽  
Crystal Phase ◽  
Average Particle ◽  
Starting Solution ◽  
Ultrasonic Spray ◽  
Nickel Particles

Spherical fine Ni particles were prepared by ultrasonic spray pyrolysis, and the effects of starting materials, carrier gas, and pyrolysis temperature on the crystal phase of the fine particles were investigated. When the mist of starting solution was pyrolyzed at 850 °C in a N2 atmosphere, the crystal phase of fine particles obtained from Ni (CH3COO)2·4H2O was in good agreement with that of Ni. Furthermore, the other phases were not observed. The average particle size of the spherical Ni fine particles was 0.45 μm.

scholarly journals Enhanced Visible and Ultraviolet Light-Induced Gas-Phase Photocatalytic Activity of TiO2 Thin Films Modified by Increased Amount of Acetylacetone in Precursor Solution for Spray Pyrolysis

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1011
Author(s):  
Jekaterina Spiridonova ◽  
Arvo Mere ◽  
Malle Krunks ◽  
Merilin Rosenberg ◽  
Anne Kahru ◽  
...  
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Spray Pyrolysis ◽  
Flow Reactor ◽  
Ultrasonic Spray Pyrolysis ◽  
Precursor Solution ◽  
Molar Ratio ◽  
Tio2 Thin Films ◽  
Ultrasonic Spray ◽  
Great Possibility

TiO2 thin films, modified by acetylacetone (AcacH) in solution, were deposited on glass substrate by ultrasonic spray pyrolysis and tested for photocatalytic activity in a multi-section continuous flow reactor by degradation of acetone and acetaldehyde under ultraviolet and visible light. The increase in molar ratio of AcacH in respect of titanium (IV) isopropoxide (TTIP) from 1:5 to 1:8 modified the electronic structure of the films, favoring enhanced photocatalytic activity. The photocatalytic activity was enhanced approximately twofold on the film with molar ratio 1:8 under both irradiations; the film completely oxidized 10 ppm of acetone and acetaldehyde. The photocatalytic efficacy of TiO2 films in oxidation of air pollutants was three times higher compared to the industrial glass Pilkington ActivTM. Moreover, all the synthesized films indicate antibacterial efficiency against E. coli of over 99% under ultraviolet. TiO2 film, with TTIP:AcacH molar ratio 1:8 having great possibility for its commercial use as a material for indoor air purification.

scholarly journals SYNTHESIS OF GOLD NANOPARTICLES THROUGH ULTRASONIC SPRAY PYROLYSIS AND ITS APPLICATION IN PRINTED ELECTRONICS

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Rebeka Rudolf ◽  
Mohammed Shariq ◽  
Valentina Veselinovic ◽  
Tijana Adamovic ◽  
Rajko Bobovnik ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Spray Pyrolysis ◽  
Process Parameters ◽  
Printed Electronics ◽  
Ultrasonic Spray Pyrolysis ◽  
Precursor Solution ◽  
Second Step ◽  
Synthesis Mechanism ◽  
Ultrasonic Spray ◽  
Edx Analyses

This work presents a review of Ultrasonic Spray Pyrolysis (USP) as a technique for the synthesis of gold nanoparticle (AuNPs). The synthesis mechanism involved the preparation of the precursor solution from Au (III) Acetate and the study of the process parameters. AuNPs were characterized with different techniques, such as DLS, UV-vis and SEM-EDX analyses. In the second step, the AuNPs` ink was prepared with the following procedure: (i) Concentration of the AuNPs through Rotavapor, (ii) Filtration of the concentrated AuNPs through Amicon Ultra 15 Centrifugal Filters. Then, it was used directly for printing on an Ag plate. In the final part, we present some information about AuNPs` future applications, which could be in printed electronics with conducted patterns.

scholarly journals Morphology of Composite Fe@Au Submicron Particles, Produced with Ultrasonic Spray Pyrolysis and Potential for Synthesis of Fe@Au Core–Shell Particles

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3326 ◽  
Author(s):  
Peter Majerič ◽  
Darja Feizpour ◽  
Bernd Friedrich ◽  
Žiga Jelen ◽  
Ivan Anžel ◽  
...  
Keyword(s):  
Spray Pyrolysis ◽  
Au Nanoparticles ◽  
Continuous Process ◽  
Synthesis Method ◽  
Ultrasonic Spray Pyrolysis ◽  
Precursor Solution ◽  
Submicron Particles ◽  
Fe Oxide ◽  
Ultrasonic Spray ◽  
Concentration Ratios

Iron core–gold shell (Fe@Au) nanoparticles are prominent for their magnetic and optical properties, which are especially beneficial for biomedical uses. Some experiments were carried out to produce Fe@Au particles with a one-step synthesis method, Ultrasonic Spray Pyrolysis (USP), which is able to produce the particles in a continuous process. The Fe@Au particles were produced with USP from a precursor solution with dissolved Iron (III) chloride and Gold (III) chloride, with Fe/Au concentration ratios ranging from 0.1 to 4. The resulting products are larger Fe oxide particles (mostly maghemite Fe2O3), with mean sizes of about 260–390 nm, decorated with Au nanoparticles (AuNPs) with mean sizes of around 24–67 nm. The Fe oxide core particles are mostly spherical in all of the experiments, while the AuNPs become increasingly irregular and more heavily agglomerated with lower Fe/Au concentration ratios in the precursor solution. The resulting particle morphology from these experiments is caused by surface chemistry and particle to solvent interactions during particle formation inside the USP system.

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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