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Synthesis of spherical SiO2 using scaled-up ultrasonic pyrolysis process

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2019, 29(1), pp.12-18
  • DOI : 10.6111/JKCGCT.2019.29.1.012
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Received : January 3, 2019
  • Accepted : January 20, 2019
  • Published : February 28, 2019

Woo Kyu Kang 1 Ji-Hyeon Lee 2 Jin-Ho Kim 3 Kwangtaek Hwang 3 Jang, Gun-eik 1

1충북대학교
2한국세라믹기술원 이천분원
3한국세라믹기술원

Accredited

ABSTRACT

The spherical SiO2 powders were synthesized by the scaled-up ultrasonic pyrolysis (USP). The aqueous SiO2 sol, which contained 20~30 nm SiO2 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 SiO2 sol on the morphologies of synthesized SiO2 particles. the synthesized SiO2 particle showed a pseudo-crystal phase, spherical morphology, and a smooth surface. The size of the spherical SiO2 particle decreased as both reaction temperature increased and precursor concentration decreased. In addition, the synthesized SiO2 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 SiO2 particle synthesized via the lab-scale USP showed a larger particle size.

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