Estimation of formation mechanism of spherical fine ZrO2-SiO2 particles by ultrasonic spray pyrolysis

1988 ◽  
Vol 23 (9) ◽  
pp. 3067-3072 ◽  
Author(s):  
Yoshinori Kanno ◽  
Tadashi Suzuki
Keyword(s):  
Spray Pyrolysis ◽  
Formation Mechanism ◽  
Ultrasonic Spray Pyrolysis ◽  
Ultrasonic Spray ◽  
Sio2 Particles

Effect of Starting Solution on Microstructure of Spherical SiO2 Particles Prepared by Ultrasonic Spray Pyrolysis

1987 ◽  
Vol 95 (1103) ◽  
pp. 682-685 ◽  
Author(s):  
Katsunori NOGAMI ◽  
Osamu SAKURAI ◽  
Nobuyasu MIZUTANI ◽  
Masanori KATO
Keyword(s):  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Starting Solution ◽  
Ultrasonic Spray ◽  
Sio2 Particles

Synthesis, morphology, and formation mechanism of mullite particles produced by ultrasonic spray pyrolysis

1996 ◽  
Vol 11 (7) ◽  
pp. 1706-1716 ◽  
Author(s):  
Dj. Janaćković ◽  
V. Jokanović ◽  
Lj. Kostić-Gvozdenović ◽  
Lj. Živković ◽  
D. Uskoković
Keyword(s):  
Spray Pyrolysis ◽  
Silicic Acid ◽  
Formation Mechanism ◽  
Ultrasonic Spray Pyrolysis ◽  
Spherical Particles ◽  
Mullite Phase ◽  
Ultrasonic Spray ◽  
Solution Preparation ◽  
Subsequent Phase ◽  
Mullite Powder

Submicrometer spherical particles of mullite powder were synthesized by ultrasonic spray pyrolysis of emulsion and solutions, using tetra-ethyl-orthosilicate (TEOS) or silicic-acid and Al(NO3)3 · 9H2O as initial compounds. Crystallization of mullite phase was determined by differential thermal (DT), thermogravimetric (TG), infrared (IR), and x-ray analyses. The synthesis of mullite from TEOS emulsion occurs by crystallization of γ–Al2O3 (or Al, Si-spinel) from the amorphous phase and its subsequent reaction with amorphous SiO2, as well as by crystallization of pseudotetragonal mullite below 1000 °C and its subsequent phase transformation into orthorhombic mullite. In the powders produced from silicic acid solutions, synthesis of mullite occurs only by crystallization of γ–Al2O3 between 900 and 1000 °C and its further reaction with amorphous SiO2 between 1100 and 1200 °C. Particle formation mechanism depended directly on the initial emulsion or solution preparation, i.e., on the phase separation in the emulsion and on the silicic-acid crosslinking conditions.

scholarly journals Synthesis and Formation Mechanism of Ultrafine Spherical Al2O3 Powders by Ultrasonic Spray Pyrolysis

1996 ◽  
Vol 37 (4) ◽  
pp. 627-635 ◽  
Author(s):  
V. Jokanovic ◽  
Dj. Janackovic ◽  
A. M. Spasic ◽  
D. Uskokovic
Keyword(s):  
Spray Pyrolysis ◽  
Formation Mechanism ◽  
Ultrasonic Spray Pyrolysis ◽  
Ultrasonic Spray

Formation Mechanism, Morphology and Synthesis of α-Al2O3 Mullite and Cordierite Particles Obtained by the Ultrasonic Spray Pyrolysis

1996 ◽  
Vol 214 ◽  
pp. 215-222 ◽  
Author(s):  
Dj. Janaćković ◽  
V. Jokanović ◽  
Lj. Kostic-Gvozdenovic ◽  
Dragan P. Uskokovic
Keyword(s):  
Spray Pyrolysis ◽  
Formation Mechanism ◽  
Ultrasonic Spray Pyrolysis ◽  
Ultrasonic Spray

Fireworks: How to Simulate the Manufacture and Operation in the Atmosphere with the Substitution of Ultrasonic Spray Pyrolysis

2018 ◽  
Vol 15 (2) ◽  
pp. 147-156
Author(s):  
Rebeka Rudolf ◽  
Urban Ferčec ◽  
Mohammed Shariq
Keyword(s):  
Spray Pyrolysis ◽  
Final Section ◽  
Web Of Science ◽  
Raw Materials ◽  
Ultrasonic Spray Pyrolysis ◽  
Physiochemical Properties ◽  
Physical Size ◽  
Respiratory Problems ◽  
Ultrasonic Spray ◽  
Temperature Ranges

Background: This review provides a closer look at recent work in the field of fireworks manufacture, which could see the replacement of micron-sized particles with their nano-scaled counterparts. Moreover, we also discuss micron-sized particles as well as nanoparticles (NPs) from K, Fe, Al, Ti, Ba, etc., that are produced in the atmosphere as a result of these fireworks. One of the possible technological substitutes for fireworks is presented in detail, i.e., the use of ultrasonic spray pyrolysis (USP) technology. Method: We searched Google, Web of Science and PubMed for a literature survey of fireworks and their products: firecrackers, micron-sized and nanoparticles. Moreover, we used some of our own knowledge and experimental data to strengthen the possibility of simulating the synthesis of firework products on the laboratory scale. Results: The use of nano reactants and oxidisers has seen a substantial increase in the sound efficiency and a decrease in the amount of chemicals used, making fireworks more eco-friendly. The application of Al- and Ti-based nano flash powder in the size range from 35 nm to 50 μm resulted in a significant improvement in the ignition properties of the fireworks. Under changing aerodynamic conditions, it is difficult to collect them as samples for real-time monitoring, needed for their characterization or the testing of their harmfulness under laboratory conditions. As a result, NPs below 100 nm in the surroundings could be easily inhaled into the lungs and cause more pulmonary and respiratory problems than micron-sized particles. USP produces nanoparticles in the laboratory that could replace the conventional micron-sized firecracker raw materials, or nanoparticles that are similar to those formed by fireworks. It will also help to identify the physiochemical properties of the airborne particulates in order to understand and evaluate their impact. </P><P> This review could be valuable for a controlled economic synthesis through USP, and in the use of nanopowders in pyrotechnology that could reduce pollution to a great extent, thus contributing to the growth and good practise of the fireworks industry. With respect to the USP synthesis, we have also discussed in detail the physical (size, shape) and chemical (composition) characteristics of Al2O3 and TiO2 NPs from different precursors and their temperature ranges. An in-depth explanation for a comparative analysis for the formation mechanism of nanoparticles through both fireworks and USP is presented in the final section. We can produce nanoparticles in the laboratory with ultrasonic spray pyrolysis that have similar properties to those produced from fireworks and can then be used for further testing.

scholarly journals Strong texture tuning along different crystalline directions in glass-supported CeO2 thin films by ultrasonic spray pyrolysis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Inti Zumeta-Dubé ◽  
José Manuel García Rangel ◽  
Jorge Roque ◽  
Issis Claudette Romero-Ibarra ◽  
Mario Fidel García Sánchez
Keyword(s):  
Thin Films ◽  
Spray Pyrolysis ◽  
Spray Pyrolysis Technique ◽  
Morphological Characteristics ◽  
Ultrasonic Spray Pyrolysis ◽  
Cost Effective ◽  
Growth Direction ◽  
Large Area ◽  
Smart Windows ◽  
Ultrasonic Spray

AbstractThe strong facet-dependent performance of glass-supported CeO2 thin films in different applications (catalysis, smart windows, etc.) has been the target of diverse fundamental and technological approaches. However, the design of accurate, cost-effective and scalable methods with the potential for large-area coverage that produce highly textured glass-supported CeO2 thin films remains a technological challenge. In the present work, it is demonstrated that under proper tuning conditions, the ultrasonic spray pyrolysis technique enables one to obtain glass-supported polycrystalline CeO2 films with noticeable texture along both the (100) and (111) directions, as well as with randomly oriented crystallites (no texture). The influence of flow rates, solution molarity, and substrate temperature on the texture and morphological characteristics, as well as optical absorption and Raman response of the deposited films, is evaluated. The obtained results are discussed on the basis of the combined dependence of the CeO2-exposed surfaces on the thermodynamic stability of the corresponding facets and the reaction kinetics, which modulate the crystallite growth direction.

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