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제108회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Investigation on effect of carrier viscosity and flow rate on retention of microparticles in gravitational field-flow fractionation

2011년 8월 1일 16시 19분 37초
Ⅳ-ANAL.P-208 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 <발표Ⅳ>
저자 및
우인숙, 이승호, 김선태, DouHaiyang, 정의창1
한남대학교 화학과, Korea
1한국원자력연구원 원자력화학연구부, Korea
Gravitational field-flow fractionation (GrFFF) is the experimentally simplest among the family of FFF techniques. GrFFF utilizes the Earth's gravity as the external force field which drives analyte particles (usually micrometer-sized particles because of the relatively weak field strength) towards the channel bottom that is placed horizontally. In this study, the effect of the carrier liquid viscosity and flow rate on the retention, and thus the size-based selectivity (Sd) and zone-broadening of microparticles in GrFFF were investigated using polystyrene (PS) latex beads as the model particles. The carrier liquid viscosity was controlled by adding an appropriate amount of (hydroxyl propyl) methyl cellulose (HPMC) in the aqueous carrier liquid. The effect of the carrier viscosity was investigated at various flow rates. The flow rate was varied from 0.5 to 4 ml/min. The size-based size selectivity, ionic strength, retention ratio (R), and the plate height (H) of PS beads were measured at various conditions of the carrier viscosity and flow rate. Results suggest that particles migrate at faster rates as the carrier viscosity increases due to increased flow rate-induced lift forces (‘hydrodynamic lift forces’, HLF). This study has shown that the influence of carrier liquid viscosity on HLF must be taken into account in GrFFF analysis of micron-sized particles.