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http://dx.doi.org/10.6111/JKCGCT.2019.29.1.012

Synthesis of spherical SiO2 using scaled-up ultrasonic pyrolysis process  

Kang, Woo-kyu (Department of Materials Engineering, Chungbuk National University)
Lee, Ji-Hyeon (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Kim, Jin-Ho (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Hwang, Kwang-Taek (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Jang, Gun-Eik (Department of Materials Engineering, Chungbuk National University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.29, no.1, 2019 , pp. 12-18 More about this Journal
Abstract
The spherical $SiO_2$ powders were synthesized by the scaled-up ultrasonic pyrolysis (USP). The aqueous $SiO_2$ sol, which contained 20~30 nm $SiO_2$ particles, was used as a precursor for the scaled-up USP. The effects of the USP operating conditions and precursor conditions were systematically investigated, including reaction temperature, gas flow rate, and the concentration of $SiO_2$ sol on the morphologies of synthesized $SiO_2$ particles. the synthesized $SiO_2$ particle showed a pseudo-crystal phase, spherical morphology, and a smooth surface. The size of the spherical $SiO_2$ particle decreased as both reaction temperature increased and precursor concentration decreased. In addition, the synthesized $SiO_2$ particle size was increased by increasing the gas flow rate. Lastly, the scaled-up USP was compared with the lab-scale USP based on the same process conditions. Due to a short retention time in the reaction tube during the USP process, the $SiO_2$ particle synthesized via the lab-scale USP showed a larger particle size.
Keywords
$SiO_2$; Ultrasonic pyrolysis; Scaled-up; $SiO_2$ sol; Spherical particle;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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