나노입자들의 자기조립에 의한 TiO_2-SiO_2 다공체 제조
Synthesis of Porous TiO_2-SiO_2Particles by Self-assembly of Nanoparticles
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Porous TiO_2-SiO_2 particles were synthesized by co-assembly of nanoparticles of TiO_2 and SiO_2 in evaporating aerosol droplets. Poly styrene latex(PSL) particles were employed as a template of porous particles. Flowrate of dispersion gas, weight ratio of TiO_2/SiO_2 and SiO_2 concentration in the precursor, and PSL size were chosen as process variables. The morphology, crystal structure, chemical bonding, and pore size distribution were analyzed by Fe-SEM, XRD, FT-IR, BET. The morphology of porous TiO2-SiO2 particles was spherical and the average particle size range were from 1 to 10 ㎛. The particles were composed of meso and macro pores. The average particle diameter and pore volume of the as prepared particles were dependant on process variables. It was found that UV-Vis absorption of the porous particles was comparable with pure TiO_2 nanoparticles even though TiO_2/SiO_2 ratio is low in the porous particles.
Abstract
Porous TiO_2-SiO_2 particles were synthesized by co-assembly of nanoparticles of TiO_2 and SiO_2 in evaporating aerosol droplets. Poly styrene latex(PSL) particles were employed as a template of porous particles. Flowrate of dispersion gas, weight ratio of TiO_2/SiO_2 and SiO_2 concentration in the precursor, and PSL size were chosen as process variables. The morphology, crystal structure, chemical bonding, and pore size distribution were analyzed by Fe-SEM, XRD, FT-IR, BET. The morphology of porous TiO2-SiO2 particles was spherical and the average particle size range were from 1 to 10 ㎛. The particles were composed of meso and macro pores. The average particle diameter and pore volume of the as prepared particles were dependant on process variables. It was found that UV-Vis absorption of the porous particles was comparable with pure TiO_2 nanoparticles even though TiO_2/SiO_2 ratio is low in the porous particles.
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