scholarly journals Stability of rare‐earth‐doped spherical yttria‐stabilized zirconia synthesized by ultrasonic spray pyrolysis

2017 ◽  
Vol 100 (10) ◽  
pp. 4425-4434 ◽  
Author(s):  
Nazia Nafsin ◽  
Hui Li ◽  
Elisabeth W. Leib ◽  
Tobias Vossmeyer ◽  
Pieter Stroeve ◽  
...  
Keyword(s):  
Rare Earth ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Ultrasonic Spray ◽  
Rare Earth Doped

scholarly journals Synthesis of porous yttria-stabilized zirconia microspheres by ultrasonic spray pyrolysis

2017 ◽  
Vol 188 ◽  
pp. 41-44 ◽  
Author(s):  
Maria Perez-Page ◽  
Ryan Guzalowski ◽  
Dereck N.F. Muche ◽  
Ricardo H.R. Castro ◽  
Pieter Stroeve
Keyword(s):  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Ultrasonic Spray

Preparation and Electrical Conductivity of Scandia Stabilized Zirconia by using Ultrasonic Spray Pyrolysis

2007 ◽  
Vol 44 (12) ◽  
pp. 690-695
Author(s):  
Young-Hoon Choi ◽  
Dong-Hyun Peck ◽  
Young-Chul Park ◽  
Kyoung-Tae Lim ◽  
Dong-Soo Suhr ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Stabilized Zirconia ◽  
Ultrasonic Spray

scholarly journals NdFeB Magnets Recycling Process: An Alternative Method to Produce Mixed Rare Earth Oxide from Scrap NdFeB Magnets

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 716
Author(s):  
Elif Emil Kaya ◽  
Ozan Kaya ◽  
Srecko Stopic ◽  
Sebahattin Gürmen ◽  
Bernd Friedrich
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Leach Liquor ◽  
Spray Pyrolysis Method ◽  
Ndfeb Magnets ◽  
X Ray ◽  
Ultrasonic Spray ◽  
Pyrolysis Method

Neodymium iron boron magnets (NdFeB) play a critical role in various technological applications due to their outstanding magnetic properties, such as high maximum energy product, high remanence and high coercivity. Production of NdFeB is expected to rise significantly in the coming years, for this reason, demand for the rare earth elements (REE) will not only remain high but it also will increase even more. The recovery of rare earth elements has become essential to satisfy this demand in recent years. In the present study rare earth elements recovery from NdFeB magnets as new promising process flowsheet is proposed as follows; (1) acid baking process is performed to decompose the NdFeB magnet to increase in the extraction efficiency for Nd, Pr, and Dy. (2) Iron was removed from the leach liquor during hydrolysis. (3) The production of REE-oxide from leach liquor using ultrasonic spray pyrolysis method. Recovery of mixed REE-oxide from NdFeB magnets via ultrasonic spray pyrolysis method between 700 °C and 1000 °C is a new innovative step in comparison to traditional combination of precipitation with sodium carbonate and thermal decomposition of rare earth carbonate at 850 °C. The synthesized mixed REE- oxide powders were characterized by X-ray diffraction analysis (XRD). Morphological properties and phase content of mixed REE- oxide were revealed by scanning electron microscopy (SEM) and Energy-dispersive X-ray (EDX) analysis. To obtain the size and particle size distribution of REE-oxide, a search algorithm based on an image-processing technique was executed in MATLAB. The obtained particles are spherical with sizes between 362 and 540 nm. The experimental values of the particle sizes of REE- oxide were compared with theoretically predicted ones.

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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