| Title |
Characteristic Analysis of Electret Filters made by Electrospinning |
| Authors |
김길태(Gil-Tae Kim) ; 안영철(Young-Chull Ahn) ; 이재근(Jae-Keun Lee) |
| Keywords |
전기방사 ; 정전필터 ; 여과효율 ; 대전전하밀도 ; 대전전위 Electrospinning ; Electret filter ; Filtration efficiency ; Charge density ; Charge potential |
| Abstract |
Electret filter media are used in general ventilation filters, disposable respirators, vehicle cabin filters, vacuum cleaners and room air cleaners. There are basic mechanisms of interception, inertial impaction, diffusion, gravitational settling, electrostatic attraction by which an aerosol particle can be deposited onto a fiber in a filter. The ability of fine particle removal strongly depends on the electrostatic forces between particles and polarized fibers. Thus, the stability of the fiber polarization is a major factor in the reliability of electret filters. In this study, the electret filter is made by electrospinning process using Polystyrene which is dissolved by 5:5 of Tetrahydrofuran (THF) and Dimethylformamide (DMF). Also the electrical properties and the filtration performances of electrospun filter media are quantitatively investigated. Electrical properties of electrospun filters have been studied on surface charge potential and surface charge density. Also the filtration performance of the electret filters are evaluated on collection efficiency. The surface charge potential and the surface charge density of electrospun PS filters are increased with increasing applied voltage and saturated at 30kV of applied voltage. Also collection efficiency of electrospun filters is increased with increasing surface charge potential and surface charge density. But the surface charge potential is decreased by natural decay and it causes deterioration of particle collection efficiency. |