| Summary: | 碩士 === 國立臺北科技大學 === 環境工程與管理研究所 === 105 === Filtration is a kind of the common method to remove particle. The electret filter can greatly enhance filter quality by electrostatic mechanisms. Besides, some research indicated that the higher the specific surface area of the fibers is, the greater the surface voltage on fiber is. Therefore, this study tried to use the charged hollow-porous fiber and the charged notch-porous fibers to investigate the filtration characteristics and to improve the filter quality. Coaxial needle and co-electrospinning system was set up in this study. Besides, the precursor materials of filter were PS and PEO. The results of this study showed that hollow-porous fiber and notch-porous fiber filter could be produced when the core material was removed after electrospinning in the appropriate environment humidity. In addition, this study set up normal electrospinning system to produce smooth (PMMA) fiber filter. The results show that the average surface voltage of smooth fiber, hollow-porous fiber, and notch-porous fiber was -0.82 kV, -0.90 kV, and -1.10 kV, respectively, after negative charging. The results also revealed that the surface voltage of notch-porous fiber was higher than smooth fiber and hollow-porous fiber, due to the higher specific surface area. The hollow-porous fiber filter also had high specific surface area, however, its internal specific surface area is invalid for average surface voltage due to the shielded surface. After charging, the filter quality of smooth fiber decreased from 0.023 (1/Pa) to 0.042 (1/Pa), hollow-porous fiber decreased from 0.027 (1/Pa) to 0.055 (1/Pa) and notch-porous fiber decreased from 0.030 (1/Pa) to 0.068 (1/Pa). The experimental results indicated that the surface voltage, penetration, single fiber efficiency and filter quality of notch-porous fiber were more prominent than smooth fiber and hollow-porous after charging.
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