Filtration efficiency of an electrostatic fibrous filter: Studying filtration dependency on ultrafine particle exposure and composition

Ardkapan, Siamak Rahimi; Johnson, Matthew S.; Yazdi, Sadegh; Afshari, Alireza; Bergsøe, Niels Christian

doi:10.1016/j.jaerosci.2014.02.002

Cited by 57 publications

(27 citation statements)

References 17 publications

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“…The electret fabrics such as melt‐blown polypropylene (PP) nonwovens is considered as the best air purification material applied in residential environment, especially in reducing indoor exposure to influenza particles because of their unique electrostatic filtering mechanism besides the mechanical mechanism including inertial capture, interception and diffusion . However, PP is not easy to be broken down and will stay in the landfill for long time.…”

Section: Introductionmentioning

confidence: 99%

Electret characteristics of melt‐blown polylactic acid fabrics for air filtration application

Zhang

Chen

Bhat

et al. 2019

J of Applied Polymer Sci

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Polylactic acid (PLA) is a biodegradable and biocompatible polymer. Melt‐blown PLA electret fabrics have become attractive materials for air filter applications. Its filtration performance mainly depends on the electrostatic effect originating from electrets. How to improve their electret behavior and then to enhance their filtration efficiency has always been challenging. In this article, three melt‐blown PLA fabrics with different morphological or crystal structure are made from different process conditions or ingredient. The electrets are formed by means of corona charging technology. Their crystalline and morphological structure was analyzed, and filtration performance was measured. Their charge‐trapping feature was studied by thermal stimulating discharge technology. The results proved that the air filtration efficiency of three melt‐blown samples improved a lot when electrets were formed. Different crystalline structures of PLA fabrics will result in differences in their electret charge‐trapping feature. The PLA fabrics with semi‐crystalline characteristics display a regular charge‐trapped level distribution and amorphous structure hints the diversity of charge‐trapped levels. The deference in filtration resistance is mainly ascribed to the different fiber diameters and their distributions. More narrow distribution of fiber diameter leads to more compact fabrics and to higher filtration resistance. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48309.

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Section: Introductionmentioning

confidence: 99%

Electret characteristics of melt‐blown polylactic acid fabrics for air filtration application

Zhang

Chen

Bhat

et al. 2019

J of Applied Polymer Sci

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“…Joubert et al (2011) developed a pressure drop model of a HEPA filter based on experiment. Ardkapan, Johnson, Yazdi, Afshari and Bergsøe (2014) studied the relationship between filtration efficiencies and ultrafine particle concentrations for an electrostatic fibrous filter. In addition, numerical simulation methods were used in exploring the mechanisms of particle filtration.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of the filtration process in fibrous filters using CFD-DEM method

Yue

Zhang

Zhai

2016

Journal of Aerosol Science

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“…3,4 In general, brous lters can be classied as spunbonded lters, needle-punched lters, melt blown lters and electrospun lters. Among them, traditional lters, such as spun-bonded lters and needle-punched lters, capture the particles primarily by a mechanical ltration mechanism.…”

Section: Introductionmentioning

confidence: 99%

Design of electret polypropylene melt blown air filtration material containing nucleating agent for effective PM2.5 capture

et al. 2018

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Particulate matter (PM) pollution has become a serious threat to public health, climate and ecosystems.Therefore, filtration materials with high filtration efficiency and low air resistance are in urgent need. Electret filters that can significantly improve filtration efficiency without increasing pressure drop are widely used for air filtration. However, long-term maintenance of the electrical charges on electret filters, particularly at high temperatures and in wet conditions, is still a challenge. Herein, we report the fabrication of a novel electret filter with a fluffy structure, high porosity and satisfactory filtration stability using polypropylene (PP) as the matrix polymer and magnesium stearate (MgSt) as the charge enhancer. Benefiting from the fluffy structure created by melt blown at a large die-to-collector distance (DCD), the pressure drop decreased from 67.0 Pa to 52.9 Pa at an air flow rate of 85 L min À1

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Filtration efficiency of an electrostatic fibrous filter: Studying filtration dependency on ultrafine particle exposure and composition

Cited by 57 publications

References 17 publications

Electret characteristics of melt‐blown polylactic acid fabrics for air filtration application

Electret characteristics of melt‐blown polylactic acid fabrics for air filtration application

Numerical simulation of the filtration process in fibrous filters using CFD-DEM method

Design of electret polypropylene melt blown air filtration material containing nucleating agent for effective PM2.5 capture

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