Tuning the Morphology of ZnO Nanostructures with the Ultrasonic Spray Pyrolysis Process

Emil, Elif; Alkan, Gözde; Gürmen, Sebahattin; Rudolf, Rebeka; Jenko, Darja; Friedrich, Bernd

doi:10.3390/met8080569

Cited by 34 publications

(11 citation statements)

References 26 publications

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“…From these methods, the ultrasonic-spray-pyrolysis (USP) technique has been considered very promising since it enables the synthesis of pure, spherical, and fine nanoparticles as part of a one-step process. Moreover, this technique is capable of synthesizing metal/metal oxides with precisely controllable chemical composition, and particle size and morphology by manipulating process parameters such as solution concentration, temperature, gas-flow rate, and ultrasound frequency [15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

New Proposal for Size and Size-Distribution Evaluation of Nanoparticles Synthesized via Ultrasonic Spray Pyrolysis Using Search Algorithm Based on Image-Processing Technique

et al. 2019

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Nanoparticle properties are correlated to their size, size distribution, and shape; it is essential to accurately measure these features in the field of nanoscience. In this study, silver nanoparticles (AgNPs) were synthesized with the ultrasonic-spray-pyrolysis (USP) method from a water solution of silver nitrate. The synthesized AgNPs were characterized by Dynamic Light Scattering (DLS) analysis and Scanning Electron Microscopy (SEM) to reveal their size and size distribution. A search algorithm based on an image-processing technique to obtain particle size and particle-size distribution from SEM micrographs is proposed. In order to obtain more quantitative information and data with respect to the morphology of particles synthesized under different process parameters, SEM micrographs with a nonhomogeneous background contrast were examined via image-processing techniques in MATLAB. Due to the inhomogeneous contrast of SEM micrographs, defining an overall threshold value was insufficient in the detection of whole nanoparticles. Thus, subimages were directly created according to the maximum and minimum particle size specified by the user to determine local threshold values. The obtained results were automatically combined to represent both particle dimension and location in the SEM micrographs. We confirmed that the results of our DLS analysis, theoretical calculation, and image-processing technique were correlated with our expected results.

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Section: Introductionmentioning

confidence: 99%

New Proposal for Size and Size-Distribution Evaluation of Nanoparticles Synthesized via Ultrasonic Spray Pyrolysis Using Search Algorithm Based on Image-Processing Technique

et al. 2019

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“…Spray pyrolysis (SP) exhibits wide applications in synthesis of powder materials with various structures in numerous fields, for instance, dense spheres, [86,87] hollow spheres, [88][89][90] yolk-shell structure, [91][92][93] core-shell structure, [94,95] nanoplates, [96][97][98] etc. The whole process of SP is divided into four parts, including solution nebulization, solvent evaporation, solute precipitation, metal-salt pyrolysis (Figure 12a).…”

Section: Spray Pyrolysis Methodsmentioning

confidence: 99%

Research Progress of Single‐Crystal Nickel‐Rich Cathode Materials for Lithium Ion Batteries

et al. 2021

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Single-crystal nickel-rich cathode materials (SC-NRCMs) are the most promising candidates for next-generation power batteries which enable longer driving range and reliable safety. In this review, the outstanding advantages of SC-NRCMs are discussed systematically in aspects of structural and thermal stabilities. Particularly, the intergranular-crack-free morphology exhibits superior cycling performance and negligible parasitic reactions even under severe conditions. Besides, various synthetic methods are summarized and the relation between precursor, sintering process, and final single-crystal products are revealed, providing a full view of synthetic methods. Then, challenges of SC-NRCMs in fields of kinetics of lithium diffusion and the one particularly occurred at high voltage (intragranular cracks and aggravated parasitic reactions) are discussed. The corresponding mechanism and modifications are also referred. Through this review, it is aimed to highlight the magical morphology of SC-NRCMs for application perspective and provide a reference for following researchers.

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“…spherical and fine REE-oxide in one-step. Moreover, the technique is capable of metal o ide with controllable chemical composition, particle size and morphology of particles b manipulating process parameters, which for the precursor type and concentration, rea tion atmosphere, carrier gas flow rate, and reaction temperature [30][31][32]. In the prese study, a new sustainable method was proposed for the production of mixed REE-oxid from REE-rich leach liquor.…”

Section: Introductionmentioning

confidence: 99%

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

Emil-Kaya

Kaya

Stopić

et al. 2021

Metals

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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.

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Tuning the Morphology of ZnO Nanostructures with the Ultrasonic Spray Pyrolysis Process

Cited by 34 publications

References 26 publications

New Proposal for Size and Size-Distribution Evaluation of Nanoparticles Synthesized via Ultrasonic Spray Pyrolysis Using Search Algorithm Based on Image-Processing Technique

New Proposal for Size and Size-Distribution Evaluation of Nanoparticles Synthesized via Ultrasonic Spray Pyrolysis Using Search Algorithm Based on Image-Processing Technique

Research Progress of Single‐Crystal Nickel‐Rich Cathode Materials for Lithium Ion Batteries

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

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