Preparation of Mesoporous and Spherical-shaped Silica Particles by Spray Pyrolysis

분무열분해 공정을 이용한 메조기공을 가지는 실리카 구형입자의 제조

Baek, Chul-Min;Jung, Kyeong Youl;Park, Kyun Young;Park, Seung Bin;Cho, Sung Baek
백철민;정경열;박균영;박승빈;조성백

  • Received : 2008.05.10
  • Accepted : 2008.07.14
  • Published : 2008.10.31

Abstract

Spray pyrolysis was applied to prepare spherical silica particles with mesopores of a regular structure. The physical properties such as surface area, pore size, pore structure, particle size, and morphology were studied by BET, SEM, SAXS, and DLS analysis. At a fixed gas flow rate, the BET surface area changed from 200 to $1,290m^2/g$ as changing the CTAB/TEOS molar ratio from 0.05 to 0.3. At a fixed CTAB/TEOS ratio, the surface area of silica particles was varied from 1,062 to $1,305m^2/g$ with changing the gas flow rate from 10 to 40 l/min. The average pore size measured by BJH desorption was about $21{\sim}23{\AA}$ and not significantly influenced by the CTAB/TEOS ratio and the gas flow rate. Finally, the highest surface area which was $1,305m^2/g$ were obtained when the CTAB/TEOS ratio and the gas flow rate were 0.2 and 20 l/min, respectively. According to SAXS analysis, the prepared silica particles showed a strong peak at $2{\theta}=2.6^{\circ}$ and two minor peaks around $2{\theta}=4.4^{\circ}$ and $5.1^{\circ}$, which are due to regular mesopores of hexagonal structure. The morphology of silica particles prepared were spherical shape and the average particle size was $1.0{\mu}m$.

Keywords

Silica;Mesopore;Spray Pyrolysis;Aerosol Process

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Acknowledgement

Supported by : 지식경제부