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Synthesis of mesoporous silica microspheres using phosphate surfactants or polymeric surfactants as a cosurfactant

2009년 8월 14일 15시 39분 18초
금29B6구 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 15시 : 20분
재료화학 - Recent Progresses in Materials Chemistry
저자 및
김종윤, 최용석1, 박용준, 송규석
한국원자력연구원 원자력화학연구부, Korea
1충남대학교 바이오고분자, Korea
Synthesis of mesoporous sililca microspheres have drawn special interest from many researchers because the micron-sized uniform silica particles rather than the nanoparticles are more suitable in a packed-bed reactor system and a fluidized-bed reactor system. In addition, the very small nanoparticles also have the potential environmental and biological effects, and therefore the nanostructured microparticles are becoming more and more attractive to many chemist and chemical engineers. However, the synthesis of mesoporous silica microspheres via the surfactant template synthesis normally requires an expensive silica precursor or a long reaction time. The mesoporous silica microspheres prepared by using n-dodecylamine as a surfactant template in a recent report also show a heavily aggregated particles, and we have recently reported the stable mesoporous silica microspheres without any aggregation between particles successfully prepared by using n-dodecylamine as a surfactant template and bis(2-ethylhexyl)phosphate (HDEHP) as a cosurfactant. In this study, the structual properties and morphologies of nanostructured silica microspheres depending on the type of cosurfactant, the composition of the reactant solution, and other reaction conditions have been carefully investigated to elucidate the role of cosurfactants, including their potential applications in nuclear industries. Surface morphologies of the silica microspheres were significantly different depending on the type of phosphate surfactants. Phosphate surfactant with two alkyl chains rather than with three alkyl chains showed more stable pore structures as well as smoother and more stable surface morphologies regardless of the reaction conditions.