An Innovative Filtration Approach With Triboelectric and Bimodal PA6/PVDF Nanofibrous Air Filters via the Electro‐Blowing Method

Abstract

ABSTRACTFibers with electrostatic capture properties and bimodal structures, combining fibers of different diameters, offer innovative filtration approaches with low‐pressure drop and high efficiency. In this study, PA6 and dielectric PVDF nanofibrous mats, positioned differently in the triboelectric series, are produced via the electro‐blowing technique. To identify the most effective factors influencing filter performance, four groups are prepared: unimodal single‐layer filters, group X (fibers with the same diameters but different polymers for triboelectric effect), group Y (fibers with different diameters and polymers for bimodal + triboelectric effects), and group Z (fibers with only different diameters for only bimodal effect). The unimodal PVDF mats show 100% higher surface potential and the highest filtration efficiency (99.233%) among single‐layered samples. Multi‐layered samples perform better, with the four‐layered bimodal PA6/PVDF showing the greatest efficiency improvement due to both bimodal structure and triboelectric effect. After corona charging, sample Y3's filtration efficiency increases from 99.886% to 99.997%, with minimal change in pressure drop. After one month and IPA treatment, it retains a surface potential of −0.26 kV and 99.829% efficiency. The higher surface potential of group Y confirms the triboelectric effect, while its superior performance highlights the advantages of bimodal and electret effects. Trial Registration: Not applicable, as this study does not involve a clinical trial.