Pore-Controlled Synthesis of Mesoporous Silica Particles by Spray Pyrolysis from Aqueous Silicic Acid

규산 수용액으로부터 분무열분해법에 의한 기공 특성이 제어된 메조기공의 다공성 실리카 분말 합성

  • Chang, Han Kwon (Rare Metals Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Lee, Jin Woo (Rare Metals Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Oh, Kyoung Joon (R/D Center, RTI Engineering Co.) ;
  • Jang, Hee Dong (Rare Metals Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Kil, Dae Sup (Rare Metals Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Choi, Jeong Woo (Department of Chemical and Biomolecular Engineering, Sogang University)
  • 장한권 (한국지질자원연구원 희유자원연구센터) ;
  • 이진우 (한국지질자원연구원 희유자원연구센터) ;
  • 오경준 (RTI 엔지니어링 기술연구소) ;
  • 장희동 (한국지질자원연구원 희유자원연구센터) ;
  • 길대섭 (한국지질자원연구원 희유자원연구센터) ;
  • 최정우 (서강대학교 화공생명공학과)
  • Published : 2012.06.30

Abstract

Spherical mesoporous silica particles, of which main pore diameter was 3.8 nm, were successfully prepared by spray pyrolysis from aqueous silicic acid. The effect of precursor concentration, reaction temperature, and the addition of urea and PEG on the particle diameter and pore properties such as pore diameter, total pore volume, and specific surface area were investigated by using FE-SEM, particle size analyzer, and nitrogen absorption-desorption analysis. With an increase of the precursor concentration from 0.2 M to 0.7 M, the average particle diameter, total pore volume, and specific surface area of the porous silica particles increased from 0.56 to $0.96\;{\mu}m$, 0.434 to $0.486\;cm^3/g$, 467.8 to $610.4\;m^2/g$, respectively. Within the temperature range $(600\;^{\circ}C{\sim}800\;^{\circ}C)$, there was no significant difference in the pore diameter, total pore volume, and specific surface area. In addition, the addition of urea as an expansion aid led to slight increases in particle diameter, pore diameter, and specific surface area. However, when the polyethylene glycol (PEG) as an organic template was used, the total pore volume of porous particles increased dramatically.

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