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Emulsion법에 의한 실리카 분말의 합성에서 반응조건이 입자의 형성에 미치는 영향
이상근,장윤식,문병영,강범수,박희찬,Lee S. G.,Jang Y. S.,Moon B. Y.,Kang B. S.,Park H. C. 한국재료학회 2005 한국재료학회지 Vol.15 No.11
Silica powders were synthesized using emulsion solution containing water, nonionic surfactant of Triton N-57, and cyclohexane. Silica powders were prepared at low cost using inexpensive starting material of sodium silicate and ammonium sulfate. Morphology, size and size distribution were observed and determined using SEM. The powder was identified as silica by FT-IR and XRD analysis. Particle size and size distributions were affected by concentration of reactants, reaction time, and concentration of surfactant. Particle size were increased with increasing concentration of reactants and particles became dense with increasing reaction time. As R value increased, tile particle size was increased, reached a certain value and then decreased again. The silica powders synthesized under optimum condition were spherical in shape, $0.8{\mu}m$ in average particle size, narrow in particles size distribution, and well dispersed.
이상근,김형섭,강범수,서금석,박성수,박희찬,Lee, S.G.,Kim, H.S.,Kang, B.S.,Seo, G.S.,Park, S.S.,Park, H.C. 한국재료학회 2006 한국재료학회지 Vol.16 No.6
Fine silica powders were synthesized via w/o emulsion method using sodium silicate, ammonium sulfate, Triton N-57, and cyclohexane as silica source, precipitating agent, surfactant, and oil phase, respectively. The powders were prepared under a conventional process and an ultrasonic process using the same reactants at room temperature for 1 hr varying the concentration of $Na_2SiO_3$ solution and the mol ratio of $H_2O$/surfactant, respectively. The particle size of the silica powder was reduced with decreasing the concentration of sodium silicate solution and with increasing the mol ratio of $H_2O$/surfactant under with and without ultrasounds. The size of powder with ultrasounds was smaller than that without ultrasounds, which indicates that the application of ultrasound in the synthesis of silica powder is an efficient way to reduce particle size.