AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
Synthesis of Spherical Mesoporous Silica Particles by Spray Pyrolysis from Aqueous Silicic Acid
HANKWON CHANG, Jin Woo Lee, Hee Dong Jang, Dae-Sup Kil, Jeong Woo Choi, Korea Institute of Geoscience and Mineral Resources
Abstract Number: 702 Working Group: Nanoparticles and Materials Synthesis
Abstract We successfully prepared spherical mesoporous silica particles, of which main pore diameter was 3.8 nm, by spray pyrolysis from aqueous silicic acid. And we manipulated process variables such as precursor concentration, reaction temperature, and the addition of urea and PEG to investigate the effect of process variables on the particle diameter and pore properties such as pore diameter, total pore volume, and specific surface area. The porous particles properties were analyzed 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 um, 0.434 to 0.486 cm$^3/g, 467.8 to 610.4 m$^2/g, respectively. Within the temperature range (600 - 800 $^oC), 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.