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

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)
Publication Information
Particle and aerosol research / v.8, no.2, 2012 , pp. 89-95 More about this Journal
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.
Keywords
Spray pyrolysis; Mesoporous particles; Silicic acid; $SiO_2$; Polyethylene glycol;
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