Gas phase temperature measurements in a flame spray pyrolysis process by O2 pure rotational CARS

Author(s):  
T. Seeger ◽  
S. R. Engel ◽  
A. F. Koegler ◽  
Y. Gao ◽  
D. Kilian ◽  
...  
REAKTOR ◽  
2017 ◽  
Vol 16 (4) ◽  
pp. 189
Author(s):  
Adhi Setiawan ◽  
W Widiyastuti ◽  
Sugeng Winardi ◽  
Agung Nugroho

SYNTHESIS OF HYDROXYAPATITE BIOMATERIALS BY FLAME SPRAY PYROLYSIS PROCESS WITH ADDITION OF ORGANIC ADDITIVES. Hydroxyapatite is  biomaterial which is widely used for biomedical aplication such as implant because  biocompatible, bioactivity, and strong affinity to biopolymers. Therefore parameters of morphology and crystallinity becomes an important parameter to be controlled. The addition of the organic additive on HAp precursor with ethylene glycol, polyethylene glycol 400, and urea is the alternative to improve the size, morphology, and crystallinity of HAp particles. The equipment for flame spray pyrolysis process includes ultrasonic nebulizer, flame reactor, and eletrostatic precipitator. The amount of organic additives used in experiment is  30%, 50%, and 100% by mass of the precursor. The result of SEM and XRD showed HAp synthesized by the addition of additive material has a smaller size than without using the additive and crystallinity is better than no additive. In addition HAp synthesized by the addition of 30% PEG additive have smallest average particle size about 114 nm, crystalite size about 16,6 nm and spherical morphology with a low agglomeration. Keywords: Hidroxyapatite, organic additives, flame spray pyrolysis, morfology  Abstrak Hydroxyapatite merupakan biomaterial yang seringkali diaplikasikan dalam biomedis sebagai bahan implant karena sifatnya yang biocompatible, bioactivity, dan memiliki afinitas yang kuat terhadap biopolimer. Oleh karena itu parameter morfologi serta kristalinitas partikel menjadi parameter penting untuk dikontrol. Penambahan aditif organik pada prekursor HAp dengan etilen glikol, polietilen glikol 400, serta urea merupakan alternativ agar memperbaiki ukuran, morfologi, serta meningkatkan kristalinitas partikel HAp. Peralatan utama flame spray pyrolysis meliputi ultrasonic nebulizer, reaktor flame, dan eletrostatik precipitator. Jumlah aditif organik yang digunakan pada eksperimen antara lain 30%, 50%, dan 100% massa prekursor. Hasil SEM dan XRD menunjukkan bahwa HAp yang disintesis dengan penambahan bahan aditif memiliki ukuran lebih kecil daripada tanpa menggunakan aditif dan tingkat kristalinitasnya lebih baik dibandingkan tanpa aditif. Selain itu HAp yang disintesis dengan penambahan aditif PEG sebanyak 30% memiliki ukuran rata-rata partikel yang terkecil yaitu sebesar 114 nm dengan ukuran kristal mencapai 16,6 nm serta memiliki morfologi bulat dengan tingkat aglomerasi yang rendah.


2020 ◽  
Vol 12 (2) ◽  
pp. 263-268
Author(s):  
Zeno Rizqi Ramadhan ◽  
Changhun Yun ◽  
Bo-In Park ◽  
Seunggun Yu ◽  
Sung Bin Park ◽  
...  

The nanoparticles based on nickel-manganese oxide and carbon-coated LiNi0.5Mn1.5O4 are synthesized by flame spray pyrolysis technology with controlled particle sizes. The structural properties of nanoparticles are characterized by X-ray diffraction and high-resolution electron microscopy. It is observed that the higher surface tension of precursors in the flame spray pyrolysis setup increases the particle sizes. The post annealing treatment significantly enhances the crystallinity of nanoparticles due to the favorable oxidation process and the structure conversion from NiMn2O4 to NiMnO3. In addition, the solid-state reaction of as-prepared NiMn2O4 results in the LiNi0.5Mn1.5O4 nanoparticles which can be applied to the cathode in Li-ion batteries. The carboncoated LiNi0.5Mn1.5O4 nanoparticles are also made by additional carbonization reaction. The control of surface tension of precursors in the flame spray pyrolysis process is expected to result in the small size of nanoparticles, which can result in high cyclic stability and high capacity for Li-ion batteries.


Author(s):  
Pedro Bianchi Neto ◽  
Lizoel Buss ◽  
Florian Meierhofer ◽  
Henry F. Meier ◽  
Udo Fritsching ◽  
...  

2020 ◽  
Vol 215 ◽  
pp. 389-400 ◽  
Author(s):  
Haipeng Li ◽  
Suman Pokhrel ◽  
Marco Schowalter ◽  
Andreas Rosenauer ◽  
Johannes Kiefer ◽  
...  

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