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09월 04일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내
Synthesis and size characterization of silica nanoparticles using Asymmetrical Flow Field-Flow Fractionation (AF4): Large-scale synthesis
2014년 9월 4일 15시 57분 51초
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10월 15일 (수요일) 16:00~19:00
한남대학교 화학과, Korea
한국원자력연구원 원자력화학연구부, Korea
Silica nanoparticles are used widely in various fields such as food, medical, and biological industries. The particle size is one of important parameters that determines characteristics (and thus their applicability) of the silica nanoparticles. Accurate sizing technique is thus required for quality control in synthesis of silica nanoparticles. Various techniques have been used for size characterization of nanoparticles including dynamic light scattering (DLS), electron microscopy (transmission electron microscopy (TEM) and scanning electron microscope (SEM)), and field-flow fractionation (FFF). Unlike others, FFF provides size-based separation of colloidal particles. In FFF, retention time is directly related with particle size, and thus a FFF elution profile can be converted to size distribution directly. It has been shown that FFF is useful for separation of particles ranging in size from a few nm up to about 100 μm. Synthesis of silica nanoparticles having narrow size distributions is not trivial as there are various parameters affecting the characteristics of the synthesized silica nanoparticles. In this study, silica nanoparticles were synthesized by emulsion polymerization by mixing ethanol with ammonium hydroxide, and tetra ethyl orthosilicate (TEOS) at room temperature. And then the asymmetrical flow FFF (AF4), a member of FFF family, was employed for size characterization of the silica particles. The AF4 results were compared with those obtained from SEM and DLS. First, the synthesis was performed in a smaller scale (about 175 mL), where the effect on the particle size distribution (PSD) of various parameters were systematically investigated. Then the scale was enlarged to about 2 L. It was observed that, as the purity of TEOS or ethanol increases, the size of the silica particles tended to decrease, while, as the purity of ammonium hydroxide increases, the size of silica nanoparticles tended to increase. Results suggest AF4 is a useful tool for fast and accurate determination of the size distribution of particles of various types including silica nanoparticles.
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