10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
Investigation of Charge Decay Degree in Electret Filters with Various Surface Charge Densities
WOO JIN LEE, Jungho Hwang, Myong-Hwa Lee, Korea Institute of Industrial Technology, Yonsei University
Abstract Number: 630 Working Group: Aerosol Exposure
Abstract PM2.5, i.e. particulate matters less than 2.5μm, is one of the major components that cause serious impact to a human respiratory system. Recently, many people utilize an air respirator and an air purifier to protect their body from fine particles. Electret filter, which is made by meltblowing a polypropylene polymer followed by corona charging, is generally used as a filter medium. However there are several reports that particle collection efficiency of the filter decreases over time by exposure to organic species and water(Motyl et al., 2006; Xiao et al., 2014). Many researchers tried to clarify the charge decay mechanism, however, it is still uncertain.
We investigated the charge decay degree in electret filters with various surface charge densities. As a result, we found that electret filter with higher surface charge density was more tolerable to isopropyl alcohol exposure than others.
<Reference> 1. E. Motyl, B. Lowkis, Effect of air humidity on charge decay and lifetime of PP electret nonwovens, Fibres Text. East. Eur. 14, 5, (2006) 39-42. 2. H. Xiao, Y. Song, G. Chen, Correlation between charge decay and solvent effect for melt-blown polypropylene electret filter fabrics, J. Electrost. 72, (2014) 311-314.
<Acknowledgment> This work was financially supported by the KITECH(Korea Institute of Industrial Technology) R&D program(project number : UR 170021).