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Keywords = flame-assisted spray pyrolysis

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14 pages, 7141 KB  
Article
Control of Particle Size in Flame Spray Pyrolysis of Tb–doped Y2O3 for Bio-Imaging
by Sovann Khan, Yunseok Choi, Hak-Young Ahn, Jae Hyun Han, Byeong-Kwon Ju, Jaewon Chung and So-Hye Cho
Materials 2020, 13(13), 2987; https://doi.org/10.3390/ma13132987 - 4 Jul 2020
Cited by 7 | Viewed by 3955
Abstract
Recently, the use of oxide-based nanomaterials for bio-imaging has received great attention owing to their remarkable stabilities as compared to those of conventional organic dyes. Therefore, the development of scalable methods for highly luminescent oxide materials with fine control of size has become [...] Read more.
Recently, the use of oxide-based nanomaterials for bio-imaging has received great attention owing to their remarkable stabilities as compared to those of conventional organic dyes. Therefore, the development of scalable methods for highly luminescent oxide materials with fine control of size has become crucial. In this study, we suggested modified flame spray pyrolysis (FSP) as a scalable method to produce a green-light emitting phosphor—Tb–doped Y2O3—in the nanometer size range. In our FSP method, an alkali salt (NaNO3) was found to be highly effective as a size-controlling agent when it is simply mixed with other metal nitrate precursors. The FSP of the mixture solution resulted in oxide composites of Y2O3:Tb3+ and NaxO. However, the sodium by-product was easily removed by washing with water. This salt-assisted FSP produced nano-sized and well-dispersed Y2O3:Tb3+ nanoparticles; their crystallinity and luminescence were higher than those of the bulk product made without the addition of the alkali salt. The nanoparticle surface was further coated with silica for biocompatibility and functionalized with amino groups for the attachment of biological molecules. Full article
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17 pages, 6111 KB  
Article
Fast Production of High Performance LiNi0.815Co0.15Al0.035O2 Cathode Material via Urea-Assisted Flame Spray Pyrolysis
by Cornelius Satria Yudha, Soraya Ulfa Muzayanha, Mintarsih Rahmawati, Hendri Widiyandari, Wahyudi Sutopo, Muhammad Nizam, Sigit Puji Santosa and Agus Purwanto
Energies 2020, 13(11), 2757; https://doi.org/10.3390/en13112757 - 1 Jun 2020
Cited by 16 | Viewed by 3906
Abstract
The high throughput and rapid flame-assisted spray pyrolysis method has been adapted to synthesize cathode materials LiNi0.apCo0.15Al0.035O2 (NCA). This method is considered low cost and simple. By varying the precursor solution concentration and sintering temperature, the [...] Read more.
The high throughput and rapid flame-assisted spray pyrolysis method has been adapted to synthesize cathode materials LiNi0.apCo0.15Al0.035O2 (NCA). This method is considered low cost and simple. By varying the precursor solution concentration and sintering temperature, the optimal condition was established at temperature sintering of 800 °C and precursor solution concentration of 1 M. X-ray diffraction patterns showed the as-prepared NCA particles exhibit a pure well-ordered hexagonal layer structure with high crystallinity. Polyhedral shaped micro-sized particles are confirmed by SEM images. Galvanostic charge–discharge tests were conducted using cylindrical full-cell utilizing artificial graphite as the anode. The highest specific initial discharge capacity measured between 2.7 and 4.3 V is 155 mAh g−1 with capacity retention of 92% after cycled at 0.2 C for 50 cycles. Thus, this method is considered as a satisfying approach for NCA mass production. Full article
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11 pages, 7853 KB  
Article
Flame-Assisted Spray Pyrolysis Using an Annular Flame Nozzle with Decoupled Velocity Control
by Maxym Rukosuyev, Syed Baqar, Jungsoo Nam, Huitaek Yun and Martin Byung-Guk Jun
J. Manuf. Mater. Process. 2018, 2(4), 75; https://doi.org/10.3390/jmmp2040075 - 30 Oct 2018
Cited by 2 | Viewed by 6619
Abstract
Flame spray pyrolysis, widely used in chemical industries, is a technology to synthesize nanoparticles. While the flame spray pyrolysis uses fuels as a solution liquid, the flame-assisted spray pyrolysis method uses aqueous solutions. Since process parameters such as concentration of precursor, size of [...] Read more.
Flame spray pyrolysis, widely used in chemical industries, is a technology to synthesize nanoparticles. While the flame spray pyrolysis uses fuels as a solution liquid, the flame-assisted spray pyrolysis method uses aqueous solutions. Since process parameters such as concentration of precursor, size of droplets, and ratio of the air–gas mixture affect the size of nanoparticles, developing a flexible system to control these parameters is required. This paper proposes a new type of nozzle system to produce nanoparticles using flame-assisted spray pyrolysis. The annular nozzle design allows flexible control of particle flow and temperature, and an ultrasonic nebulizer was used to produce droplets with different size. Experiments were conducted to analyze the relationship between nanoparticle size and process parameters, concentration of precursor, frequency of the atomizer, and flame temperature. A precursor solution consisting of silver nitrate (AgNO3) mixed in deionized water is used. The effects of the process parameters are discussed, and analysis of the nanoparticles shows that silver nanoparticles are deposited with an average size of 25~115 nm. Full article
(This article belongs to the Special Issue Micro and Nano-Manufacturing)
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